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block: Fix AioContext locking in qmp_block_resize()
[qemu/kevin.git] / blockdev.c
blobc91f49e7b62c04a3bd8155826294692a4ebfa5fc
1 /*
2 * QEMU host block devices
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2 or
7 * later. See the COPYING file in the top-level directory.
8 *
9 * This file incorporates work covered by the following copyright and
10 * permission notice:
11 *
12 * Copyright (c) 2003-2008 Fabrice Bellard
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
18 * copies of the Software, and to permit persons to whom the Software is
19 * furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice shall be included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
27 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32
33 #include "qemu/osdep.h"
34 #include "sysemu/block-backend.h"
35 #include "sysemu/blockdev.h"
36 #include "hw/block/block.h"
37 #include "block/blockjob.h"
38 #include "block/dirty-bitmap.h"
39 #include "block/qdict.h"
40 #include "block/throttle-groups.h"
41 #include "monitor/monitor.h"
42 #include "qemu/error-report.h"
43 #include "qemu/option.h"
44 #include "qemu/qemu-print.h"
45 #include "qemu/config-file.h"
46 #include "qapi/qapi-commands-block.h"
47 #include "qapi/qapi-commands-transaction.h"
48 #include "qapi/qapi-visit-block-core.h"
49 #include "qapi/qmp/qdict.h"
50 #include "qapi/qmp/qnum.h"
51 #include "qapi/qmp/qstring.h"
52 #include "qapi/error.h"
53 #include "qapi/qmp/qerror.h"
54 #include "qapi/qmp/qlist.h"
55 #include "qapi/qobject-output-visitor.h"
56 #include "sysemu/sysemu.h"
57 #include "sysemu/iothread.h"
58 #include "block/block_int.h"
59 #include "block/trace.h"
60 #include "sysemu/runstate.h"
61 #include "sysemu/replay.h"
62 #include "qemu/cutils.h"
63 #include "qemu/help_option.h"
64 #include "qemu/main-loop.h"
65 #include "qemu/throttle-options.h"
66
67 /* Protected by BQL */
68 QTAILQ_HEAD(, BlockDriverState) monitor_bdrv_states =
69 QTAILQ_HEAD_INITIALIZER(monitor_bdrv_states);
70
71 void bdrv_set_monitor_owned(BlockDriverState *bs)
72 {
73 GLOBAL_STATE_CODE();
74 QTAILQ_INSERT_TAIL(&monitor_bdrv_states, bs, monitor_list);
75 }
76
77 static const char *const if_name[IF_COUNT] = {
78 [IF_NONE] = "none",
79 [IF_IDE] = "ide",
80 [IF_SCSI] = "scsi",
81 [IF_FLOPPY] = "floppy",
82 [IF_PFLASH] = "pflash",
83 [IF_MTD] = "mtd",
84 [IF_SD] = "sd",
85 [IF_VIRTIO] = "virtio",
86 [IF_XEN] = "xen",
87 };
88
89 static int if_max_devs[IF_COUNT] = {
90 /*
91 * Do not change these numbers! They govern how drive option
92 * index maps to unit and bus. That mapping is ABI.
93 *
94 * All controllers used to implement if=T drives need to support
95 * if_max_devs[T] units, for any T with if_max_devs[T] != 0.
96 * Otherwise, some index values map to "impossible" bus, unit
97 * values.
98 *
99 * For instance, if you change [IF_SCSI] to 255, -drive
100 * if=scsi,index=12 no longer means bus=1,unit=5, but
101 * bus=0,unit=12. With an lsi53c895a controller (7 units max),
102 * the drive can't be set up. Regression.
103 */
104 [IF_IDE] = 2,
105 [IF_SCSI] = 7,
106 };
107
108 /**
109 * Boards may call this to offer board-by-board overrides
110 * of the default, global values.
111 */
112 void override_max_devs(BlockInterfaceType type, int max_devs)
113 {
114 BlockBackend *blk;
115 DriveInfo *dinfo;
116
117 GLOBAL_STATE_CODE();
118
119 if (max_devs <= 0) {
120 return;
121 }
122
123 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
124 dinfo = blk_legacy_dinfo(blk);
125 if (dinfo->type == type) {
126 fprintf(stderr, "Cannot override units-per-bus property of"
127 " the %s interface, because a drive of that type has"
128 " already been added.\n", if_name[type]);
129 g_assert_not_reached();
130 }
131 }
132
133 if_max_devs[type] = max_devs;
134 }
135
136 /*
137 * We automatically delete the drive when a device using it gets
138 * unplugged. Questionable feature, but we can't just drop it.
139 * Device models call blockdev_mark_auto_del() to schedule the
140 * automatic deletion, and generic qdev code calls blockdev_auto_del()
141 * when deletion is actually safe.
142 */
143 void blockdev_mark_auto_del(BlockBackend *blk)
144 {
145 DriveInfo *dinfo = blk_legacy_dinfo(blk);
146 BlockJob *job;
147
148 GLOBAL_STATE_CODE();
149
150 if (!dinfo) {
151 return;
152 }
153
154 JOB_LOCK_GUARD();
155
156 do {
157 job = block_job_next_locked(NULL);
158 while (job && (job->job.cancelled ||
159 job->job.deferred_to_main_loop ||
160 !block_job_has_bdrv(job, blk_bs(blk))))
161 {
162 job = block_job_next_locked(job);
163 }
164 if (job) {
165 /*
166 * This drops the job lock temporarily and polls, so we need to
167 * restart processing the list from the start after this.
168 */
169 job_cancel_locked(&job->job, false);
170 }
171 } while (job);
172
173 dinfo->auto_del = 1;
174 }
175
176 void blockdev_auto_del(BlockBackend *blk)
177 {
178 DriveInfo *dinfo = blk_legacy_dinfo(blk);
179 GLOBAL_STATE_CODE();
180
181 if (dinfo && dinfo->auto_del) {
182 monitor_remove_blk(blk);
183 blk_unref(blk);
184 }
185 }
186
187 static int drive_index_to_bus_id(BlockInterfaceType type, int index)
188 {
189 int max_devs = if_max_devs[type];
190 return max_devs ? index / max_devs : 0;
191 }
192
193 static int drive_index_to_unit_id(BlockInterfaceType type, int index)
194 {
195 int max_devs = if_max_devs[type];
196 return max_devs ? index % max_devs : index;
197 }
198
199 QemuOpts *drive_add(BlockInterfaceType type, int index, const char *file,
200 const char *optstr)
201 {
202 QemuOpts *opts;
203
204 GLOBAL_STATE_CODE();
205
206 opts = qemu_opts_parse_noisily(qemu_find_opts("drive"), optstr, false);
207 if (!opts) {
208 return NULL;
209 }
210 if (type != IF_DEFAULT) {
211 qemu_opt_set(opts, "if", if_name[type], &error_abort);
212 }
213 if (index >= 0) {
214 qemu_opt_set_number(opts, "index", index, &error_abort);
215 }
216 if (file)
217 qemu_opt_set(opts, "file", file, &error_abort);
218 return opts;
219 }
220
221 DriveInfo *drive_get(BlockInterfaceType type, int bus, int unit)
222 {
223 BlockBackend *blk;
224 DriveInfo *dinfo;
225
226 GLOBAL_STATE_CODE();
227
228 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
229 dinfo = blk_legacy_dinfo(blk);
230 if (dinfo && dinfo->type == type
231 && dinfo->bus == bus && dinfo->unit == unit) {
232 return dinfo;
233 }
234 }
235
236 return NULL;
237 }
238
239 /*
240 * Check board claimed all -drive that are meant to be claimed.
241 * Fatal error if any remain unclaimed.
242 */
243 void drive_check_orphaned(void)
244 {
245 BlockBackend *blk;
246 DriveInfo *dinfo;
247 Location loc;
248 bool orphans = false;
249
250 GLOBAL_STATE_CODE();
251
252 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
253 dinfo = blk_legacy_dinfo(blk);
254 /*
255 * Ignore default drives, because we create certain default
256 * drives unconditionally, then leave them unclaimed. Not the
257 * users fault.
258 * Ignore IF_VIRTIO or IF_XEN, because it gets desugared into
259 * -device, so we can leave failing to -device.
260 * Ignore IF_NONE, because leaving unclaimed IF_NONE remains
261 * available for device_add is a feature.
262 */
263 if (dinfo->is_default || dinfo->type == IF_VIRTIO
264 || dinfo->type == IF_XEN || dinfo->type == IF_NONE) {
265 continue;
266 }
267 if (!blk_get_attached_dev(blk)) {
268 loc_push_none(&loc);
269 qemu_opts_loc_restore(dinfo->opts);
270 error_report("machine type does not support"
271 " if=%s,bus=%d,unit=%d",
272 if_name[dinfo->type], dinfo->bus, dinfo->unit);
273 loc_pop(&loc);
274 orphans = true;
275 }
276 }
277
278 if (orphans) {
279 exit(1);
280 }
281 }
282
283 DriveInfo *drive_get_by_index(BlockInterfaceType type, int index)
284 {
285 GLOBAL_STATE_CODE();
286 return drive_get(type,
287 drive_index_to_bus_id(type, index),
288 drive_index_to_unit_id(type, index));
289 }
290
291 int drive_get_max_bus(BlockInterfaceType type)
292 {
293 int max_bus;
294 BlockBackend *blk;
295 DriveInfo *dinfo;
296
297 GLOBAL_STATE_CODE();
298
299 max_bus = -1;
300 for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
301 dinfo = blk_legacy_dinfo(blk);
302 if (dinfo && dinfo->type == type && dinfo->bus > max_bus) {
303 max_bus = dinfo->bus;
304 }
305 }
306 return max_bus;
307 }
308
309 static void bdrv_format_print(void *opaque, const char *name)
310 {
311 qemu_printf(" %s", name);
312 }
313
314 typedef struct {
315 QEMUBH *bh;
316 BlockDriverState *bs;
317 } BDRVPutRefBH;
318
319 static int parse_block_error_action(const char *buf, bool is_read, Error **errp)
320 {
321 if (!strcmp(buf, "ignore")) {
322 return BLOCKDEV_ON_ERROR_IGNORE;
323 } else if (!is_read && !strcmp(buf, "enospc")) {
324 return BLOCKDEV_ON_ERROR_ENOSPC;
325 } else if (!strcmp(buf, "stop")) {
326 return BLOCKDEV_ON_ERROR_STOP;
327 } else if (!strcmp(buf, "report")) {
328 return BLOCKDEV_ON_ERROR_REPORT;
329 } else {
330 error_setg(errp, "'%s' invalid %s error action",
331 buf, is_read ? "read" : "write");
332 return -1;
333 }
334 }
335
336 static bool parse_stats_intervals(BlockAcctStats *stats, QList *intervals,
337 Error **errp)
338 {
339 const QListEntry *entry;
340 for (entry = qlist_first(intervals); entry; entry = qlist_next(entry)) {
341 switch (qobject_type(entry->value)) {
342
343 case QTYPE_QSTRING: {
344 uint64_t length;
345 const char *str = qstring_get_str(qobject_to(QString,
346 entry->value));
347 if (parse_uint_full(str, 10, &length) == 0 &&
348 length > 0 && length <= UINT_MAX) {
349 block_acct_add_interval(stats, (unsigned) length);
350 } else {
351 error_setg(errp, "Invalid interval length: %s", str);
352 return false;
353 }
354 break;
355 }
356
357 case QTYPE_QNUM: {
358 int64_t length = qnum_get_int(qobject_to(QNum, entry->value));
359
360 if (length > 0 && length <= UINT_MAX) {
361 block_acct_add_interval(stats, (unsigned) length);
362 } else {
363 error_setg(errp, "Invalid interval length: %" PRId64, length);
364 return false;
365 }
366 break;
367 }
368
369 default:
370 error_setg(errp, "The specification of stats-intervals is invalid");
371 return false;
372 }
373 }
374 return true;
375 }
376
377 typedef enum { MEDIA_DISK, MEDIA_CDROM } DriveMediaType;
378
379 /* All parameters but @opts are optional and may be set to NULL. */
380 static void extract_common_blockdev_options(QemuOpts *opts, int *bdrv_flags,
381 const char **throttling_group, ThrottleConfig *throttle_cfg,
382 BlockdevDetectZeroesOptions *detect_zeroes, Error **errp)
383 {
384 Error *local_error = NULL;
385 const char *aio;
386
387 if (bdrv_flags) {
388 if (qemu_opt_get_bool(opts, "copy-on-read", false)) {
389 *bdrv_flags |= BDRV_O_COPY_ON_READ;
390 }
391
392 if ((aio = qemu_opt_get(opts, "aio")) != NULL) {
393 if (bdrv_parse_aio(aio, bdrv_flags) < 0) {
394 error_setg(errp, "invalid aio option");
395 return;
396 }
397 }
398 }
399
400 /* disk I/O throttling */
401 if (throttling_group) {
402 *throttling_group = qemu_opt_get(opts, "throttling.group");
403 }
404
405 if (throttle_cfg) {
406 throttle_config_init(throttle_cfg);
407 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].avg =
408 qemu_opt_get_number(opts, "throttling.bps-total", 0);
409 throttle_cfg->buckets[THROTTLE_BPS_READ].avg =
410 qemu_opt_get_number(opts, "throttling.bps-read", 0);
411 throttle_cfg->buckets[THROTTLE_BPS_WRITE].avg =
412 qemu_opt_get_number(opts, "throttling.bps-write", 0);
413 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].avg =
414 qemu_opt_get_number(opts, "throttling.iops-total", 0);
415 throttle_cfg->buckets[THROTTLE_OPS_READ].avg =
416 qemu_opt_get_number(opts, "throttling.iops-read", 0);
417 throttle_cfg->buckets[THROTTLE_OPS_WRITE].avg =
418 qemu_opt_get_number(opts, "throttling.iops-write", 0);
419
420 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].max =
421 qemu_opt_get_number(opts, "throttling.bps-total-max", 0);
422 throttle_cfg->buckets[THROTTLE_BPS_READ].max =
423 qemu_opt_get_number(opts, "throttling.bps-read-max", 0);
424 throttle_cfg->buckets[THROTTLE_BPS_WRITE].max =
425 qemu_opt_get_number(opts, "throttling.bps-write-max", 0);
426 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].max =
427 qemu_opt_get_number(opts, "throttling.iops-total-max", 0);
428 throttle_cfg->buckets[THROTTLE_OPS_READ].max =
429 qemu_opt_get_number(opts, "throttling.iops-read-max", 0);
430 throttle_cfg->buckets[THROTTLE_OPS_WRITE].max =
431 qemu_opt_get_number(opts, "throttling.iops-write-max", 0);
432
433 throttle_cfg->buckets[THROTTLE_BPS_TOTAL].burst_length =
434 qemu_opt_get_number(opts, "throttling.bps-total-max-length", 1);
435 throttle_cfg->buckets[THROTTLE_BPS_READ].burst_length =
436 qemu_opt_get_number(opts, "throttling.bps-read-max-length", 1);
437 throttle_cfg->buckets[THROTTLE_BPS_WRITE].burst_length =
438 qemu_opt_get_number(opts, "throttling.bps-write-max-length", 1);
439 throttle_cfg->buckets[THROTTLE_OPS_TOTAL].burst_length =
440 qemu_opt_get_number(opts, "throttling.iops-total-max-length", 1);
441 throttle_cfg->buckets[THROTTLE_OPS_READ].burst_length =
442 qemu_opt_get_number(opts, "throttling.iops-read-max-length", 1);
443 throttle_cfg->buckets[THROTTLE_OPS_WRITE].burst_length =
444 qemu_opt_get_number(opts, "throttling.iops-write-max-length", 1);
445
446 throttle_cfg->op_size =
447 qemu_opt_get_number(opts, "throttling.iops-size", 0);
448
449 if (!throttle_is_valid(throttle_cfg, errp)) {
450 return;
451 }
452 }
453
454 if (detect_zeroes) {
455 *detect_zeroes =
456 qapi_enum_parse(&BlockdevDetectZeroesOptions_lookup,
457 qemu_opt_get(opts, "detect-zeroes"),
458 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
459 &local_error);
460 if (local_error) {
461 error_propagate(errp, local_error);
462 return;
463 }
464 }
465 }
466
467 static OnOffAuto account_get_opt(QemuOpts *opts, const char *name)
468 {
469 if (!qemu_opt_find(opts, name)) {
470 return ON_OFF_AUTO_AUTO;
471 }
472 if (qemu_opt_get_bool(opts, name, true)) {
473 return ON_OFF_AUTO_ON;
474 }
475 return ON_OFF_AUTO_OFF;
476 }
477
478 /* Takes the ownership of bs_opts */
479 static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
480 Error **errp)
481 {
482 const char *buf;
483 int bdrv_flags = 0;
484 int on_read_error, on_write_error;
485 OnOffAuto account_invalid, account_failed;
486 bool writethrough, read_only;
487 BlockBackend *blk;
488 BlockDriverState *bs;
489 ThrottleConfig cfg;
490 int snapshot = 0;
491 Error *error = NULL;
492 QemuOpts *opts;
493 QDict *interval_dict = NULL;
494 QList *interval_list = NULL;
495 const char *id;
496 BlockdevDetectZeroesOptions detect_zeroes =
497 BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
498 const char *throttling_group = NULL;
499
500 /* Check common options by copying from bs_opts to opts, all other options
501 * stay in bs_opts for processing by bdrv_open(). */
502 id = qdict_get_try_str(bs_opts, "id");
503 opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, errp);
504 if (!opts) {
505 goto err_no_opts;
506 }
507
508 if (!qemu_opts_absorb_qdict(opts, bs_opts, errp)) {
509 goto early_err;
510 }
511
512 if (id) {
513 qdict_del(bs_opts, "id");
514 }
515
516 /* extract parameters */
517 snapshot = qemu_opt_get_bool(opts, "snapshot", 0);
518
519 account_invalid = account_get_opt(opts, "stats-account-invalid");
520 account_failed = account_get_opt(opts, "stats-account-failed");
521
522 writethrough = !qemu_opt_get_bool(opts, BDRV_OPT_CACHE_WB, true);
523
524 id = qemu_opts_id(opts);
525
526 qdict_extract_subqdict(bs_opts, &interval_dict, "stats-intervals.");
527 qdict_array_split(interval_dict, &interval_list);
528
529 if (qdict_size(interval_dict) != 0) {
530 error_setg(errp, "Invalid option stats-intervals.%s",
531 qdict_first(interval_dict)->key);
532 goto early_err;
533 }
534
535 extract_common_blockdev_options(opts, &bdrv_flags, &throttling_group, &cfg,
536 &detect_zeroes, &error);
537 if (error) {
538 error_propagate(errp, error);
539 goto early_err;
540 }
541
542 if ((buf = qemu_opt_get(opts, "format")) != NULL) {
543 if (is_help_option(buf)) {
544 qemu_printf("Supported formats:");
545 bdrv_iterate_format(bdrv_format_print, NULL, false);
546 qemu_printf("\nSupported formats (read-only):");
547 bdrv_iterate_format(bdrv_format_print, NULL, true);
548 qemu_printf("\n");
549 goto early_err;
550 }
551
552 if (qdict_haskey(bs_opts, "driver")) {
553 error_setg(errp, "Cannot specify both 'driver' and 'format'");
554 goto early_err;
555 }
556 qdict_put_str(bs_opts, "driver", buf);
557 }
558
559 on_write_error = BLOCKDEV_ON_ERROR_ENOSPC;
560 if ((buf = qemu_opt_get(opts, "werror")) != NULL) {
561 on_write_error = parse_block_error_action(buf, 0, &error);
562 if (error) {
563 error_propagate(errp, error);
564 goto early_err;
565 }
566 }
567
568 on_read_error = BLOCKDEV_ON_ERROR_REPORT;
569 if ((buf = qemu_opt_get(opts, "rerror")) != NULL) {
570 on_read_error = parse_block_error_action(buf, 1, &error);
571 if (error) {
572 error_propagate(errp, error);
573 goto early_err;
574 }
575 }
576
577 if (snapshot) {
578 bdrv_flags |= BDRV_O_SNAPSHOT;
579 }
580
581 read_only = qemu_opt_get_bool(opts, BDRV_OPT_READ_ONLY, false);
582
583 /* init */
584 if ((!file || !*file) && !qdict_size(bs_opts)) {
585 BlockBackendRootState *blk_rs;
586
587 blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
588 blk_rs = blk_get_root_state(blk);
589 blk_rs->open_flags = bdrv_flags | (read_only ? 0 : BDRV_O_RDWR);
590 blk_rs->detect_zeroes = detect_zeroes;
591
592 qobject_unref(bs_opts);
593 } else {
594 if (file && !*file) {
595 file = NULL;
596 }
597
598 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
599 * with other callers) rather than what we want as the real defaults.
600 * Apply the defaults here instead. */
601 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
602 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
603 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY,
604 read_only ? "on" : "off");
605 qdict_set_default_str(bs_opts, BDRV_OPT_AUTO_READ_ONLY, "on");
606 assert((bdrv_flags & BDRV_O_CACHE_MASK) == 0);
607
608 if (runstate_check(RUN_STATE_INMIGRATE)) {
609 bdrv_flags |= BDRV_O_INACTIVE;
610 }
611
612 blk = blk_new_open(file, NULL, bs_opts, bdrv_flags, errp);
613 if (!blk) {
614 goto err_no_bs_opts;
615 }
616 bs = blk_bs(blk);
617
618 bs->detect_zeroes = detect_zeroes;
619
620 block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
621
622 if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
623 blk_unref(blk);
624 blk = NULL;
625 goto err_no_bs_opts;
626 }
627 }
628
629 /* disk I/O throttling */
630 if (throttle_enabled(&cfg)) {
631 if (!throttling_group) {
632 throttling_group = id;
633 }
634 blk_io_limits_enable(blk, throttling_group);
635 blk_set_io_limits(blk, &cfg);
636 }
637
638 blk_set_enable_write_cache(blk, !writethrough);
639 blk_set_on_error(blk, on_read_error, on_write_error);
640
641 if (!monitor_add_blk(blk, id, errp)) {
642 blk_unref(blk);
643 blk = NULL;
644 goto err_no_bs_opts;
645 }
646
647 err_no_bs_opts:
648 qemu_opts_del(opts);
649 qobject_unref(interval_dict);
650 qobject_unref(interval_list);
651 return blk;
652
653 early_err:
654 qemu_opts_del(opts);
655 qobject_unref(interval_dict);
656 qobject_unref(interval_list);
657 err_no_opts:
658 qobject_unref(bs_opts);
659 return NULL;
660 }
661
662 /* Takes the ownership of bs_opts */
663 BlockDriverState *bds_tree_init(QDict *bs_opts, Error **errp)
664 {
665 BlockDriverState *bs;
666 int bdrv_flags = 0;
667
668 GLOBAL_STATE_CODE();
669 /* bdrv_open() defaults to the values in bdrv_flags (for compatibility
670 * with other callers) rather than what we want as the real defaults.
671 * Apply the defaults here instead. */
672 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_DIRECT, "off");
673 qdict_set_default_str(bs_opts, BDRV_OPT_CACHE_NO_FLUSH, "off");
674 qdict_set_default_str(bs_opts, BDRV_OPT_READ_ONLY, "off");
675
676 if (runstate_check(RUN_STATE_INMIGRATE)) {
677 bdrv_flags |= BDRV_O_INACTIVE;
678 }
679
680 aio_context_acquire(qemu_get_aio_context());
681 bs = bdrv_open(NULL, NULL, bs_opts, bdrv_flags, errp);
682 aio_context_release(qemu_get_aio_context());
683
684 return bs;
685 }
686
687 void blockdev_close_all_bdrv_states(void)
688 {
689 BlockDriverState *bs, *next_bs;
690
691 GLOBAL_STATE_CODE();
692 QTAILQ_FOREACH_SAFE(bs, &monitor_bdrv_states, monitor_list, next_bs) {
693 AioContext *ctx = bdrv_get_aio_context(bs);
694
695 aio_context_acquire(ctx);
696 bdrv_unref(bs);
697 aio_context_release(ctx);
698 }
699 }
700
701 /* Iterates over the list of monitor-owned BlockDriverStates */
702 BlockDriverState *bdrv_next_monitor_owned(BlockDriverState *bs)
703 {
704 GLOBAL_STATE_CODE();
705 return bs ? QTAILQ_NEXT(bs, monitor_list)
706 : QTAILQ_FIRST(&monitor_bdrv_states);
707 }
708
709 static bool qemu_opt_rename(QemuOpts *opts, const char *from, const char *to,
710 Error **errp)
711 {
712 const char *value;
713
714 value = qemu_opt_get(opts, from);
715 if (value) {
716 if (qemu_opt_find(opts, to)) {
717 error_setg(errp, "'%s' and its alias '%s' can't be used at the "
718 "same time", to, from);
719 return false;
720 }
721 }
722
723 /* rename all items in opts */
724 while ((value = qemu_opt_get(opts, from))) {
725 qemu_opt_set(opts, to, value, &error_abort);
726 qemu_opt_unset(opts, from);
727 }
728 return true;
729 }
730
731 QemuOptsList qemu_legacy_drive_opts = {
732 .name = "drive",
733 .head = QTAILQ_HEAD_INITIALIZER(qemu_legacy_drive_opts.head),
734 .desc = {
735 {
736 .name = "bus",
737 .type = QEMU_OPT_NUMBER,
738 .help = "bus number",
739 },{
740 .name = "unit",
741 .type = QEMU_OPT_NUMBER,
742 .help = "unit number (i.e. lun for scsi)",
743 },{
744 .name = "index",
745 .type = QEMU_OPT_NUMBER,
746 .help = "index number",
747 },{
748 .name = "media",
749 .type = QEMU_OPT_STRING,
750 .help = "media type (disk, cdrom)",
751 },{
752 .name = "if",
753 .type = QEMU_OPT_STRING,
754 .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
755 },{
756 .name = "file",
757 .type = QEMU_OPT_STRING,
758 .help = "file name",
759 },
760
761 /* Options that are passed on, but have special semantics with -drive */
762 {
763 .name = BDRV_OPT_READ_ONLY,
764 .type = QEMU_OPT_BOOL,
765 .help = "open drive file as read-only",
766 },{
767 .name = "rerror",
768 .type = QEMU_OPT_STRING,
769 .help = "read error action",
770 },{
771 .name = "werror",
772 .type = QEMU_OPT_STRING,
773 .help = "write error action",
774 },{
775 .name = "copy-on-read",
776 .type = QEMU_OPT_BOOL,
777 .help = "copy read data from backing file into image file",
778 },
779
780 { /* end of list */ }
781 },
782 };
783
784 DriveInfo *drive_new(QemuOpts *all_opts, BlockInterfaceType block_default_type,
785 Error **errp)
786 {
787 const char *value;
788 BlockBackend *blk;
789 DriveInfo *dinfo = NULL;
790 QDict *bs_opts;
791 QemuOpts *legacy_opts;
792 DriveMediaType media = MEDIA_DISK;
793 BlockInterfaceType type;
794 int max_devs, bus_id, unit_id, index;
795 const char *werror, *rerror;
796 bool read_only = false;
797 bool copy_on_read;
798 const char *filename;
799 int i;
800
801 GLOBAL_STATE_CODE();
802
803 /* Change legacy command line options into QMP ones */
804 static const struct {
805 const char *from;
806 const char *to;
807 } opt_renames[] = {
808 { "iops", "throttling.iops-total" },
809 { "iops_rd", "throttling.iops-read" },
810 { "iops_wr", "throttling.iops-write" },
811
812 { "bps", "throttling.bps-total" },
813 { "bps_rd", "throttling.bps-read" },
814 { "bps_wr", "throttling.bps-write" },
815
816 { "iops_max", "throttling.iops-total-max" },
817 { "iops_rd_max", "throttling.iops-read-max" },
818 { "iops_wr_max", "throttling.iops-write-max" },
819
820 { "bps_max", "throttling.bps-total-max" },
821 { "bps_rd_max", "throttling.bps-read-max" },
822 { "bps_wr_max", "throttling.bps-write-max" },
823
824 { "iops_size", "throttling.iops-size" },
825
826 { "group", "throttling.group" },
827
828 { "readonly", BDRV_OPT_READ_ONLY },
829 };
830
831 for (i = 0; i < ARRAY_SIZE(opt_renames); i++) {
832 if (!qemu_opt_rename(all_opts, opt_renames[i].from,
833 opt_renames[i].to, errp)) {
834 return NULL;
835 }
836 }
837
838 value = qemu_opt_get(all_opts, "cache");
839 if (value) {
840 int flags = 0;
841 bool writethrough;
842
843 if (bdrv_parse_cache_mode(value, &flags, &writethrough) != 0) {
844 error_setg(errp, "invalid cache option");
845 return NULL;
846 }
847
848 /* Specific options take precedence */
849 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_WB)) {
850 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_WB,
851 !writethrough, &error_abort);
852 }
853 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_DIRECT)) {
854 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_DIRECT,
855 !!(flags & BDRV_O_NOCACHE), &error_abort);
856 }
857 if (!qemu_opt_get(all_opts, BDRV_OPT_CACHE_NO_FLUSH)) {
858 qemu_opt_set_bool(all_opts, BDRV_OPT_CACHE_NO_FLUSH,
859 !!(flags & BDRV_O_NO_FLUSH), &error_abort);
860 }
861 qemu_opt_unset(all_opts, "cache");
862 }
863
864 /* Get a QDict for processing the options */
865 bs_opts = qdict_new();
866 qemu_opts_to_qdict(all_opts, bs_opts);
867
868 legacy_opts = qemu_opts_create(&qemu_legacy_drive_opts, NULL, 0,
869 &error_abort);
870 if (!qemu_opts_absorb_qdict(legacy_opts, bs_opts, errp)) {
871 goto fail;
872 }
873
874 /* Media type */
875 value = qemu_opt_get(legacy_opts, "media");
876 if (value) {
877 if (!strcmp(value, "disk")) {
878 media = MEDIA_DISK;
879 } else if (!strcmp(value, "cdrom")) {
880 media = MEDIA_CDROM;
881 read_only = true;
882 } else {
883 error_setg(errp, "'%s' invalid media", value);
884 goto fail;
885 }
886 }
887
888 /* copy-on-read is disabled with a warning for read-only devices */
889 read_only |= qemu_opt_get_bool(legacy_opts, BDRV_OPT_READ_ONLY, false);
890 copy_on_read = qemu_opt_get_bool(legacy_opts, "copy-on-read", false);
891
892 if (read_only && copy_on_read) {
893 warn_report("disabling copy-on-read on read-only drive");
894 copy_on_read = false;
895 }
896
897 qdict_put_str(bs_opts, BDRV_OPT_READ_ONLY, read_only ? "on" : "off");
898 qdict_put_str(bs_opts, "copy-on-read", copy_on_read ? "on" : "off");
899
900 /* Controller type */
901 value = qemu_opt_get(legacy_opts, "if");
902 if (value) {
903 for (type = 0;
904 type < IF_COUNT && strcmp(value, if_name[type]);
905 type++) {
906 }
907 if (type == IF_COUNT) {
908 error_setg(errp, "unsupported bus type '%s'", value);
909 goto fail;
910 }
911 } else {
912 type = block_default_type;
913 }
914
915 /* Device address specified by bus/unit or index.
916 * If none was specified, try to find the first free one. */
917 bus_id = qemu_opt_get_number(legacy_opts, "bus", 0);
918 unit_id = qemu_opt_get_number(legacy_opts, "unit", -1);
919 index = qemu_opt_get_number(legacy_opts, "index", -1);
920
921 max_devs = if_max_devs[type];
922
923 if (index != -1) {
924 if (bus_id != 0 || unit_id != -1) {
925 error_setg(errp, "index cannot be used with bus and unit");
926 goto fail;
927 }
928 bus_id = drive_index_to_bus_id(type, index);
929 unit_id = drive_index_to_unit_id(type, index);
930 }
931
932 if (unit_id == -1) {
933 unit_id = 0;
934 while (drive_get(type, bus_id, unit_id) != NULL) {
935 unit_id++;
936 if (max_devs && unit_id >= max_devs) {
937 unit_id -= max_devs;
938 bus_id++;
939 }
940 }
941 }
942
943 if (max_devs && unit_id >= max_devs) {
944 error_setg(errp, "unit %d too big (max is %d)", unit_id, max_devs - 1);
945 goto fail;
946 }
947
948 if (drive_get(type, bus_id, unit_id) != NULL) {
949 error_setg(errp, "drive with bus=%d, unit=%d (index=%d) exists",
950 bus_id, unit_id, index);
951 goto fail;
952 }
953
954 /* no id supplied -> create one */
955 if (qemu_opts_id(all_opts) == NULL) {
956 char *new_id;
957 const char *mediastr = "";
958 if (type == IF_IDE || type == IF_SCSI) {
959 mediastr = (media == MEDIA_CDROM) ? "-cd" : "-hd";
960 }
961 if (max_devs) {
962 new_id = g_strdup_printf("%s%i%s%i", if_name[type], bus_id,
963 mediastr, unit_id);
964 } else {
965 new_id = g_strdup_printf("%s%s%i", if_name[type],
966 mediastr, unit_id);
967 }
968 qdict_put_str(bs_opts, "id", new_id);
969 g_free(new_id);
970 }
971
972 /* Add virtio block device */
973 if (type == IF_VIRTIO) {
974 QemuOpts *devopts;
975 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
976 &error_abort);
977 qemu_opt_set(devopts, "driver", "virtio-blk", &error_abort);
978 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
979 &error_abort);
980 } else if (type == IF_XEN) {
981 QemuOpts *devopts;
982 devopts = qemu_opts_create(qemu_find_opts("device"), NULL, 0,
983 &error_abort);
984 qemu_opt_set(devopts, "driver",
985 (media == MEDIA_CDROM) ? "xen-cdrom" : "xen-disk",
986 &error_abort);
987 qemu_opt_set(devopts, "drive", qdict_get_str(bs_opts, "id"),
988 &error_abort);
989 }
990
991 filename = qemu_opt_get(legacy_opts, "file");
992
993 /* Check werror/rerror compatibility with if=... */
994 werror = qemu_opt_get(legacy_opts, "werror");
995 if (werror != NULL) {
996 if (type != IF_IDE && type != IF_SCSI && type != IF_VIRTIO &&
997 type != IF_NONE) {
998 error_setg(errp, "werror is not supported by this bus type");
999 goto fail;
1000 }
1001 qdict_put_str(bs_opts, "werror", werror);
1002 }
1003
1004 rerror = qemu_opt_get(legacy_opts, "rerror");
1005 if (rerror != NULL) {
1006 if (type != IF_IDE && type != IF_VIRTIO && type != IF_SCSI &&
1007 type != IF_NONE) {
1008 error_setg(errp, "rerror is not supported by this bus type");
1009 goto fail;
1010 }
1011 qdict_put_str(bs_opts, "rerror", rerror);
1012 }
1013
1014 /* Actual block device init: Functionality shared with blockdev-add */
1015 blk = blockdev_init(filename, bs_opts, errp);
1016 bs_opts = NULL;
1017 if (!blk) {
1018 goto fail;
1019 }
1020
1021 /* Create legacy DriveInfo */
1022 dinfo = g_malloc0(sizeof(*dinfo));
1023 dinfo->opts = all_opts;
1024
1025 dinfo->type = type;
1026 dinfo->bus = bus_id;
1027 dinfo->unit = unit_id;
1028
1029 blk_set_legacy_dinfo(blk, dinfo);
1030
1031 switch(type) {
1032 case IF_IDE:
1033 case IF_SCSI:
1034 case IF_XEN:
1035 case IF_NONE:
1036 dinfo->media_cd = media == MEDIA_CDROM;
1037 break;
1038 default:
1039 break;
1040 }
1041
1042 fail:
1043 qemu_opts_del(legacy_opts);
1044 qobject_unref(bs_opts);
1045 return dinfo;
1046 }
1047
1048 static BlockDriverState *qmp_get_root_bs(const char *name, Error **errp)
1049 {
1050 BlockDriverState *bs;
1051 AioContext *aio_context;
1052
1053 GRAPH_RDLOCK_GUARD_MAINLOOP();
1054
1055 bs = bdrv_lookup_bs(name, name, errp);
1056 if (bs == NULL) {
1057 return NULL;
1058 }
1059
1060 if (!bdrv_is_root_node(bs)) {
1061 error_setg(errp, "Need a root block node");
1062 return NULL;
1063 }
1064
1065 aio_context = bdrv_get_aio_context(bs);
1066 aio_context_acquire(aio_context);
1067
1068 if (!bdrv_is_inserted(bs)) {
1069 error_setg(errp, "Device has no medium");
1070 bs = NULL;
1071 }
1072
1073 aio_context_release(aio_context);
1074
1075 return bs;
1076 }
1077
1078 static void blockdev_do_action(TransactionAction *action, Error **errp)
1079 {
1080 TransactionActionList list;
1081
1082 list.value = action;
1083 list.next = NULL;
1084 qmp_transaction(&list, NULL, errp);
1085 }
1086
1087 void qmp_blockdev_snapshot_sync(const char *device, const char *node_name,
1088 const char *snapshot_file,
1089 const char *snapshot_node_name,
1090 const char *format,
1091 bool has_mode, NewImageMode mode, Error **errp)
1092 {
1093 BlockdevSnapshotSync snapshot = {
1094 .device = (char *) device,
1095 .node_name = (char *) node_name,
1096 .snapshot_file = (char *) snapshot_file,
1097 .snapshot_node_name = (char *) snapshot_node_name,
1098 .format = (char *) format,
1099 .has_mode = has_mode,
1100 .mode = mode,
1101 };
1102 TransactionAction action = {
1103 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
1104 .u.blockdev_snapshot_sync.data = &snapshot,
1105 };
1106 blockdev_do_action(&action, errp);
1107 }
1108
1109 void qmp_blockdev_snapshot(const char *node, const char *overlay,
1110 Error **errp)
1111 {
1112 BlockdevSnapshot snapshot_data = {
1113 .node = (char *) node,
1114 .overlay = (char *) overlay
1115 };
1116 TransactionAction action = {
1117 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
1118 .u.blockdev_snapshot.data = &snapshot_data,
1119 };
1120 blockdev_do_action(&action, errp);
1121 }
1122
1123 void qmp_blockdev_snapshot_internal_sync(const char *device,
1124 const char *name,
1125 Error **errp)
1126 {
1127 BlockdevSnapshotInternal snapshot = {
1128 .device = (char *) device,
1129 .name = (char *) name
1130 };
1131 TransactionAction action = {
1132 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
1133 .u.blockdev_snapshot_internal_sync.data = &snapshot,
1134 };
1135 blockdev_do_action(&action, errp);
1136 }
1137
1138 SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device,
1139 const char *id,
1140 const char *name,
1141 Error **errp)
1142 {
1143 BlockDriverState *bs;
1144 AioContext *aio_context;
1145 QEMUSnapshotInfo sn;
1146 Error *local_err = NULL;
1147 SnapshotInfo *info = NULL;
1148 int ret;
1149
1150 GLOBAL_STATE_CODE();
1151 GRAPH_RDLOCK_GUARD_MAINLOOP();
1152
1153 bs = qmp_get_root_bs(device, errp);
1154 if (!bs) {
1155 return NULL;
1156 }
1157 aio_context = bdrv_get_aio_context(bs);
1158 aio_context_acquire(aio_context);
1159
1160 if (!id && !name) {
1161 error_setg(errp, "Name or id must be provided");
1162 goto out_aio_context;
1163 }
1164
1165 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, errp)) {
1166 goto out_aio_context;
1167 }
1168
1169 ret = bdrv_snapshot_find_by_id_and_name(bs, id, name, &sn, &local_err);
1170 if (local_err) {
1171 error_propagate(errp, local_err);
1172 goto out_aio_context;
1173 }
1174 if (!ret) {
1175 error_setg(errp,
1176 "Snapshot with id '%s' and name '%s' does not exist on "
1177 "device '%s'",
1178 STR_OR_NULL(id), STR_OR_NULL(name), device);
1179 goto out_aio_context;
1180 }
1181
1182 bdrv_snapshot_delete(bs, id, name, &local_err);
1183 if (local_err) {
1184 error_propagate(errp, local_err);
1185 goto out_aio_context;
1186 }
1187
1188 aio_context_release(aio_context);
1189
1190 info = g_new0(SnapshotInfo, 1);
1191 info->id = g_strdup(sn.id_str);
1192 info->name = g_strdup(sn.name);
1193 info->date_nsec = sn.date_nsec;
1194 info->date_sec = sn.date_sec;
1195 info->vm_state_size = sn.vm_state_size;
1196 info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000;
1197 info->vm_clock_sec = sn.vm_clock_nsec / 1000000000;
1198 if (sn.icount != -1ULL) {
1199 info->icount = sn.icount;
1200 info->has_icount = true;
1201 }
1202
1203 return info;
1204
1205 out_aio_context:
1206 aio_context_release(aio_context);
1207 return NULL;
1208 }
1209
1210 /* internal snapshot private data */
1211 typedef struct InternalSnapshotState {
1212 BlockDriverState *bs;
1213 QEMUSnapshotInfo sn;
1214 bool created;
1215 } InternalSnapshotState;
1216
1217 static void internal_snapshot_abort(void *opaque);
1218 static void internal_snapshot_clean(void *opaque);
1219 TransactionActionDrv internal_snapshot_drv = {
1220 .abort = internal_snapshot_abort,
1221 .clean = internal_snapshot_clean,
1222 };
1223
1224 static void internal_snapshot_action(BlockdevSnapshotInternal *internal,
1225 Transaction *tran, Error **errp)
1226 {
1227 Error *local_err = NULL;
1228 const char *device;
1229 const char *name;
1230 BlockDriverState *bs;
1231 QEMUSnapshotInfo old_sn, *sn;
1232 bool ret;
1233 int64_t rt;
1234 InternalSnapshotState *state = g_new0(InternalSnapshotState, 1);
1235 AioContext *aio_context;
1236 int ret1;
1237
1238 GLOBAL_STATE_CODE();
1239 GRAPH_RDLOCK_GUARD_MAINLOOP();
1240
1241 tran_add(tran, &internal_snapshot_drv, state);
1242
1243 device = internal->device;
1244 name = internal->name;
1245
1246 bs = qmp_get_root_bs(device, errp);
1247 if (!bs) {
1248 return;
1249 }
1250
1251 aio_context = bdrv_get_aio_context(bs);
1252 aio_context_acquire(aio_context);
1253
1254 state->bs = bs;
1255
1256 /* Paired with .clean() */
1257 bdrv_drained_begin(bs);
1258
1259 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, errp)) {
1260 goto out;
1261 }
1262
1263 if (bdrv_is_read_only(bs)) {
1264 error_setg(errp, "Device '%s' is read only", device);
1265 goto out;
1266 }
1267
1268 if (!bdrv_can_snapshot(bs)) {
1269 error_setg(errp, "Block format '%s' used by device '%s' "
1270 "does not support internal snapshots",
1271 bs->drv->format_name, device);
1272 goto out;
1273 }
1274
1275 if (!strlen(name)) {
1276 error_setg(errp, "Name is empty");
1277 goto out;
1278 }
1279
1280 /* check whether a snapshot with name exist */
1281 ret = bdrv_snapshot_find_by_id_and_name(bs, NULL, name, &old_sn,
1282 &local_err);
1283 if (local_err) {
1284 error_propagate(errp, local_err);
1285 goto out;
1286 } else if (ret) {
1287 error_setg(errp,
1288 "Snapshot with name '%s' already exists on device '%s'",
1289 name, device);
1290 goto out;
1291 }
1292
1293 /* 3. take the snapshot */
1294 sn = &state->sn;
1295 pstrcpy(sn->name, sizeof(sn->name), name);
1296 rt = g_get_real_time();
1297 sn->date_sec = rt / G_USEC_PER_SEC;
1298 sn->date_nsec = (rt % G_USEC_PER_SEC) * 1000;
1299 sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
1300 if (replay_mode != REPLAY_MODE_NONE) {
1301 sn->icount = replay_get_current_icount();
1302 } else {
1303 sn->icount = -1ULL;
1304 }
1305
1306 ret1 = bdrv_snapshot_create(bs, sn);
1307 if (ret1 < 0) {
1308 error_setg_errno(errp, -ret1,
1309 "Failed to create snapshot '%s' on device '%s'",
1310 name, device);
1311 goto out;
1312 }
1313
1314 /* 4. succeed, mark a snapshot is created */
1315 state->created = true;
1316
1317 out:
1318 aio_context_release(aio_context);
1319 }
1320
1321 static void internal_snapshot_abort(void *opaque)
1322 {
1323 InternalSnapshotState *state = opaque;
1324 BlockDriverState *bs = state->bs;
1325 QEMUSnapshotInfo *sn = &state->sn;
1326 AioContext *aio_context;
1327 Error *local_error = NULL;
1328
1329 GLOBAL_STATE_CODE();
1330 GRAPH_RDLOCK_GUARD_MAINLOOP();
1331
1332 if (!state->created) {
1333 return;
1334 }
1335
1336 aio_context = bdrv_get_aio_context(state->bs);
1337 aio_context_acquire(aio_context);
1338
1339 if (bdrv_snapshot_delete(bs, sn->id_str, sn->name, &local_error) < 0) {
1340 error_reportf_err(local_error,
1341 "Failed to delete snapshot with id '%s' and "
1342 "name '%s' on device '%s' in abort: ",
1343 sn->id_str, sn->name,
1344 bdrv_get_device_name(bs));
1345 }
1346
1347 aio_context_release(aio_context);
1348 }
1349
1350 static void internal_snapshot_clean(void *opaque)
1351 {
1352 g_autofree InternalSnapshotState *state = opaque;
1353 AioContext *aio_context;
1354
1355 if (!state->bs) {
1356 return;
1357 }
1358
1359 aio_context = bdrv_get_aio_context(state->bs);
1360 aio_context_acquire(aio_context);
1361
1362 bdrv_drained_end(state->bs);
1363
1364 aio_context_release(aio_context);
1365 }
1366
1367 /* external snapshot private data */
1368 typedef struct ExternalSnapshotState {
1369 BlockDriverState *old_bs;
1370 BlockDriverState *new_bs;
1371 bool overlay_appended;
1372 } ExternalSnapshotState;
1373
1374 static void external_snapshot_commit(void *opaque);
1375 static void external_snapshot_abort(void *opaque);
1376 static void external_snapshot_clean(void *opaque);
1377 TransactionActionDrv external_snapshot_drv = {
1378 .commit = external_snapshot_commit,
1379 .abort = external_snapshot_abort,
1380 .clean = external_snapshot_clean,
1381 };
1382
1383 static void external_snapshot_action(TransactionAction *action,
1384 Transaction *tran, Error **errp)
1385 {
1386 int ret;
1387 int flags = 0;
1388 QDict *options = NULL;
1389 Error *local_err = NULL;
1390 /* Device and node name of the image to generate the snapshot from */
1391 const char *device;
1392 const char *node_name;
1393 /* Reference to the new image (for 'blockdev-snapshot') */
1394 const char *snapshot_ref;
1395 /* File name of the new image (for 'blockdev-snapshot-sync') */
1396 const char *new_image_file;
1397 ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1);
1398 AioContext *aio_context;
1399 uint64_t perm, shared;
1400
1401 /* TODO We'll eventually have to take a writer lock in this function */
1402 GRAPH_RDLOCK_GUARD_MAINLOOP();
1403
1404 tran_add(tran, &external_snapshot_drv, state);
1405
1406 /* 'blockdev-snapshot' and 'blockdev-snapshot-sync' have similar
1407 * purpose but a different set of parameters */
1408 switch (action->type) {
1409 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
1410 {
1411 BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
1412 device = s->node;
1413 node_name = s->node;
1414 new_image_file = NULL;
1415 snapshot_ref = s->overlay;
1416 }
1417 break;
1418 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
1419 {
1420 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1421 device = s->device;
1422 node_name = s->node_name;
1423 new_image_file = s->snapshot_file;
1424 snapshot_ref = NULL;
1425 }
1426 break;
1427 default:
1428 g_assert_not_reached();
1429 }
1430
1431 /* start processing */
1432
1433 state->old_bs = bdrv_lookup_bs(device, node_name, errp);
1434 if (!state->old_bs) {
1435 return;
1436 }
1437
1438 aio_context = bdrv_get_aio_context(state->old_bs);
1439 aio_context_acquire(aio_context);
1440
1441 /* Paired with .clean() */
1442 bdrv_drained_begin(state->old_bs);
1443
1444 if (!bdrv_is_inserted(state->old_bs)) {
1445 error_setg(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
1446 goto out;
1447 }
1448
1449 if (bdrv_op_is_blocked(state->old_bs,
1450 BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, errp)) {
1451 goto out;
1452 }
1453
1454 if (!bdrv_is_read_only(state->old_bs)) {
1455 if (bdrv_flush(state->old_bs)) {
1456 error_setg(errp, QERR_IO_ERROR);
1457 goto out;
1458 }
1459 }
1460
1461 if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
1462 BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
1463 const char *format = s->format ?: "qcow2";
1464 enum NewImageMode mode;
1465 const char *snapshot_node_name = s->snapshot_node_name;
1466
1467 if (node_name && !snapshot_node_name) {
1468 error_setg(errp, "New overlay node-name missing");
1469 goto out;
1470 }
1471
1472 if (snapshot_node_name &&
1473 bdrv_lookup_bs(snapshot_node_name, snapshot_node_name, NULL)) {
1474 error_setg(errp, "New overlay node-name already in use");
1475 goto out;
1476 }
1477
1478 flags = state->old_bs->open_flags;
1479 flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_COPY_ON_READ);
1480 flags |= BDRV_O_NO_BACKING;
1481
1482 /* create new image w/backing file */
1483 mode = s->has_mode ? s->mode : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1484 if (mode != NEW_IMAGE_MODE_EXISTING) {
1485 int64_t size = bdrv_getlength(state->old_bs);
1486 if (size < 0) {
1487 error_setg_errno(errp, -size, "bdrv_getlength failed");
1488 goto out;
1489 }
1490 bdrv_refresh_filename(state->old_bs);
1491
1492 aio_context_release(aio_context);
1493 bdrv_img_create(new_image_file, format,
1494 state->old_bs->filename,
1495 state->old_bs->drv->format_name,
1496 NULL, size, flags, false, &local_err);
1497 aio_context_acquire(aio_context);
1498
1499 if (local_err) {
1500 error_propagate(errp, local_err);
1501 goto out;
1502 }
1503 }
1504
1505 options = qdict_new();
1506 if (snapshot_node_name) {
1507 qdict_put_str(options, "node-name", snapshot_node_name);
1508 }
1509 qdict_put_str(options, "driver", format);
1510 }
1511 aio_context_release(aio_context);
1512
1513 aio_context_acquire(qemu_get_aio_context());
1514 state->new_bs = bdrv_open(new_image_file, snapshot_ref, options, flags,
1515 errp);
1516 aio_context_release(qemu_get_aio_context());
1517
1518 /* We will manually add the backing_hd field to the bs later */
1519 if (!state->new_bs) {
1520 return;
1521 }
1522
1523 aio_context_acquire(aio_context);
1524
1525 /*
1526 * Allow attaching a backing file to an overlay that's already in use only
1527 * if the parents don't assume that they are already seeing a valid image.
1528 * (Specifically, allow it as a mirror target, which is write-only access.)
1529 */
1530 bdrv_get_cumulative_perm(state->new_bs, &perm, &shared);
1531 if (perm & BLK_PERM_CONSISTENT_READ) {
1532 error_setg(errp, "The overlay is already in use");
1533 goto out;
1534 }
1535
1536 if (state->new_bs->drv->is_filter) {
1537 error_setg(errp, "Filters cannot be used as overlays");
1538 goto out;
1539 }
1540
1541 if (bdrv_cow_child(state->new_bs)) {
1542 error_setg(errp, "The overlay already has a backing image");
1543 goto out;
1544 }
1545
1546 if (!state->new_bs->drv->supports_backing) {
1547 error_setg(errp, "The overlay does not support backing images");
1548 goto out;
1549 }
1550
1551 ret = bdrv_append(state->new_bs, state->old_bs, errp);
1552 if (ret < 0) {
1553 goto out;
1554 }
1555 state->overlay_appended = true;
1556
1557 out:
1558 aio_context_release(aio_context);
1559 }
1560
1561 static void external_snapshot_commit(void *opaque)
1562 {
1563 ExternalSnapshotState *state = opaque;
1564 AioContext *aio_context;
1565
1566 aio_context = bdrv_get_aio_context(state->old_bs);
1567 aio_context_acquire(aio_context);
1568
1569 /* We don't need (or want) to use the transactional
1570 * bdrv_reopen_multiple() across all the entries at once, because we
1571 * don't want to abort all of them if one of them fails the reopen */
1572 if (!qatomic_read(&state->old_bs->copy_on_read)) {
1573 bdrv_reopen_set_read_only(state->old_bs, true, NULL);
1574 }
1575
1576 aio_context_release(aio_context);
1577 }
1578
1579 static void external_snapshot_abort(void *opaque)
1580 {
1581 ExternalSnapshotState *state = opaque;
1582 if (state->new_bs) {
1583 if (state->overlay_appended) {
1584 AioContext *aio_context;
1585 AioContext *tmp_context;
1586 int ret;
1587
1588 aio_context = bdrv_get_aio_context(state->old_bs);
1589 aio_context_acquire(aio_context);
1590
1591 bdrv_ref(state->old_bs); /* we can't let bdrv_set_backind_hd()
1592 close state->old_bs; we need it */
1593 bdrv_set_backing_hd(state->new_bs, NULL, &error_abort);
1594
1595 /*
1596 * The call to bdrv_set_backing_hd() above returns state->old_bs to
1597 * the main AioContext. As we're still going to be using it, return
1598 * it to the AioContext it was before.
1599 */
1600 tmp_context = bdrv_get_aio_context(state->old_bs);
1601 if (aio_context != tmp_context) {
1602 aio_context_release(aio_context);
1603 aio_context_acquire(tmp_context);
1604
1605 ret = bdrv_try_change_aio_context(state->old_bs,
1606 aio_context, NULL, NULL);
1607 assert(ret == 0);
1608
1609 aio_context_release(tmp_context);
1610 aio_context_acquire(aio_context);
1611 }
1612
1613 bdrv_drained_begin(state->new_bs);
1614 bdrv_graph_wrlock(state->old_bs);
1615 bdrv_replace_node(state->new_bs, state->old_bs, &error_abort);
1616 bdrv_graph_wrunlock(state->old_bs);
1617 bdrv_drained_end(state->new_bs);
1618
1619 bdrv_unref(state->old_bs); /* bdrv_replace_node() ref'ed old_bs */
1620
1621 aio_context_release(aio_context);
1622 }
1623 }
1624 }
1625
1626 static void external_snapshot_clean(void *opaque)
1627 {
1628 g_autofree ExternalSnapshotState *state = opaque;
1629 AioContext *aio_context;
1630
1631 if (!state->old_bs) {
1632 return;
1633 }
1634
1635 aio_context = bdrv_get_aio_context(state->old_bs);
1636 aio_context_acquire(aio_context);
1637
1638 bdrv_drained_end(state->old_bs);
1639 bdrv_unref(state->new_bs);
1640
1641 aio_context_release(aio_context);
1642 }
1643
1644 typedef struct DriveBackupState {
1645 BlockDriverState *bs;
1646 BlockJob *job;
1647 } DriveBackupState;
1648
1649 static BlockJob *do_backup_common(BackupCommon *backup,
1650 BlockDriverState *bs,
1651 BlockDriverState *target_bs,
1652 AioContext *aio_context,
1653 JobTxn *txn, Error **errp);
1654
1655 static void drive_backup_commit(void *opaque);
1656 static void drive_backup_abort(void *opaque);
1657 static void drive_backup_clean(void *opaque);
1658 TransactionActionDrv drive_backup_drv = {
1659 .commit = drive_backup_commit,
1660 .abort = drive_backup_abort,
1661 .clean = drive_backup_clean,
1662 };
1663
1664 static void drive_backup_action(DriveBackup *backup,
1665 JobTxn *block_job_txn,
1666 Transaction *tran, Error **errp)
1667 {
1668 DriveBackupState *state = g_new0(DriveBackupState, 1);
1669 BlockDriverState *bs;
1670 BlockDriverState *target_bs;
1671 BlockDriverState *source = NULL;
1672 AioContext *aio_context;
1673 AioContext *old_context;
1674 const char *format;
1675 QDict *options;
1676 Error *local_err = NULL;
1677 int flags;
1678 int64_t size;
1679 bool set_backing_hd = false;
1680 int ret;
1681
1682 GLOBAL_STATE_CODE();
1683
1684 tran_add(tran, &drive_backup_drv, state);
1685
1686 if (!backup->has_mode) {
1687 backup->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
1688 }
1689
1690 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1691 if (!bs) {
1692 return;
1693 }
1694
1695 if (!bs->drv) {
1696 error_setg(errp, "Device has no medium");
1697 return;
1698 }
1699
1700 aio_context = bdrv_get_aio_context(bs);
1701 aio_context_acquire(aio_context);
1702
1703 state->bs = bs;
1704 /* Paired with .clean() */
1705 bdrv_drained_begin(bs);
1706
1707 format = backup->format;
1708 if (!format && backup->mode != NEW_IMAGE_MODE_EXISTING) {
1709 format = bs->drv->format_name;
1710 }
1711
1712 /* Early check to avoid creating target */
1713 bdrv_graph_rdlock_main_loop();
1714 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
1715 bdrv_graph_rdunlock_main_loop();
1716 goto out;
1717 }
1718
1719 flags = bs->open_flags | BDRV_O_RDWR;
1720
1721 /*
1722 * See if we have a backing HD we can use to create our new image
1723 * on top of.
1724 */
1725 if (backup->sync == MIRROR_SYNC_MODE_TOP) {
1726 /*
1727 * Backup will not replace the source by the target, so none
1728 * of the filters skipped here will be removed (in contrast to
1729 * mirror). Therefore, we can skip all of them when looking
1730 * for the first COW relationship.
1731 */
1732 source = bdrv_cow_bs(bdrv_skip_filters(bs));
1733 if (!source) {
1734 backup->sync = MIRROR_SYNC_MODE_FULL;
1735 }
1736 }
1737 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
1738 source = bs;
1739 flags |= BDRV_O_NO_BACKING;
1740 set_backing_hd = true;
1741 }
1742 bdrv_graph_rdunlock_main_loop();
1743
1744 size = bdrv_getlength(bs);
1745 if (size < 0) {
1746 error_setg_errno(errp, -size, "bdrv_getlength failed");
1747 goto out;
1748 }
1749
1750 if (backup->mode != NEW_IMAGE_MODE_EXISTING) {
1751 assert(format);
1752 if (source) {
1753 /* Implicit filters should not appear in the filename */
1754 BlockDriverState *explicit_backing;
1755
1756 bdrv_graph_rdlock_main_loop();
1757 explicit_backing = bdrv_skip_implicit_filters(source);
1758 bdrv_refresh_filename(explicit_backing);
1759 bdrv_graph_rdunlock_main_loop();
1760
1761 bdrv_img_create(backup->target, format,
1762 explicit_backing->filename,
1763 explicit_backing->drv->format_name, NULL,
1764 size, flags, false, &local_err);
1765 } else {
1766 bdrv_img_create(backup->target, format, NULL, NULL, NULL,
1767 size, flags, false, &local_err);
1768 }
1769 }
1770
1771 if (local_err) {
1772 error_propagate(errp, local_err);
1773 goto out;
1774 }
1775
1776 options = qdict_new();
1777 qdict_put_str(options, "discard", "unmap");
1778 qdict_put_str(options, "detect-zeroes", "unmap");
1779 if (format) {
1780 qdict_put_str(options, "driver", format);
1781 }
1782 aio_context_release(aio_context);
1783
1784 aio_context_acquire(qemu_get_aio_context());
1785 target_bs = bdrv_open(backup->target, NULL, options, flags, errp);
1786 aio_context_release(qemu_get_aio_context());
1787
1788 if (!target_bs) {
1789 return;
1790 }
1791
1792 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
1793 old_context = bdrv_get_aio_context(target_bs);
1794 aio_context_acquire(old_context);
1795
1796 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1797 if (ret < 0) {
1798 bdrv_unref(target_bs);
1799 aio_context_release(old_context);
1800 return;
1801 }
1802
1803 aio_context_release(old_context);
1804 aio_context_acquire(aio_context);
1805
1806 if (set_backing_hd) {
1807 if (bdrv_set_backing_hd(target_bs, source, errp) < 0) {
1808 goto unref;
1809 }
1810 }
1811
1812 state->job = do_backup_common(qapi_DriveBackup_base(backup),
1813 bs, target_bs, aio_context,
1814 block_job_txn, errp);
1815
1816 unref:
1817 bdrv_unref(target_bs);
1818 out:
1819 aio_context_release(aio_context);
1820 }
1821
1822 static void drive_backup_commit(void *opaque)
1823 {
1824 DriveBackupState *state = opaque;
1825 AioContext *aio_context;
1826
1827 aio_context = bdrv_get_aio_context(state->bs);
1828 aio_context_acquire(aio_context);
1829
1830 assert(state->job);
1831 job_start(&state->job->job);
1832
1833 aio_context_release(aio_context);
1834 }
1835
1836 static void drive_backup_abort(void *opaque)
1837 {
1838 DriveBackupState *state = opaque;
1839
1840 if (state->job) {
1841 job_cancel_sync(&state->job->job, true);
1842 }
1843 }
1844
1845 static void drive_backup_clean(void *opaque)
1846 {
1847 g_autofree DriveBackupState *state = opaque;
1848 AioContext *aio_context;
1849
1850 if (!state->bs) {
1851 return;
1852 }
1853
1854 aio_context = bdrv_get_aio_context(state->bs);
1855 aio_context_acquire(aio_context);
1856
1857 bdrv_drained_end(state->bs);
1858
1859 aio_context_release(aio_context);
1860 }
1861
1862 typedef struct BlockdevBackupState {
1863 BlockDriverState *bs;
1864 BlockJob *job;
1865 } BlockdevBackupState;
1866
1867 static void blockdev_backup_commit(void *opaque);
1868 static void blockdev_backup_abort(void *opaque);
1869 static void blockdev_backup_clean(void *opaque);
1870 TransactionActionDrv blockdev_backup_drv = {
1871 .commit = blockdev_backup_commit,
1872 .abort = blockdev_backup_abort,
1873 .clean = blockdev_backup_clean,
1874 };
1875
1876 static void blockdev_backup_action(BlockdevBackup *backup,
1877 JobTxn *block_job_txn,
1878 Transaction *tran, Error **errp)
1879 {
1880 BlockdevBackupState *state = g_new0(BlockdevBackupState, 1);
1881 BlockDriverState *bs;
1882 BlockDriverState *target_bs;
1883 AioContext *aio_context;
1884 AioContext *old_context;
1885 int ret;
1886
1887 tran_add(tran, &blockdev_backup_drv, state);
1888
1889 bs = bdrv_lookup_bs(backup->device, backup->device, errp);
1890 if (!bs) {
1891 return;
1892 }
1893
1894 target_bs = bdrv_lookup_bs(backup->target, backup->target, errp);
1895 if (!target_bs) {
1896 return;
1897 }
1898
1899 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
1900 aio_context = bdrv_get_aio_context(bs);
1901 old_context = bdrv_get_aio_context(target_bs);
1902 aio_context_acquire(old_context);
1903
1904 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
1905 if (ret < 0) {
1906 aio_context_release(old_context);
1907 return;
1908 }
1909
1910 aio_context_release(old_context);
1911 aio_context_acquire(aio_context);
1912 state->bs = bs;
1913
1914 /* Paired with .clean() */
1915 bdrv_drained_begin(state->bs);
1916
1917 state->job = do_backup_common(qapi_BlockdevBackup_base(backup),
1918 bs, target_bs, aio_context,
1919 block_job_txn, errp);
1920
1921 aio_context_release(aio_context);
1922 }
1923
1924 static void blockdev_backup_commit(void *opaque)
1925 {
1926 BlockdevBackupState *state = opaque;
1927 AioContext *aio_context;
1928
1929 aio_context = bdrv_get_aio_context(state->bs);
1930 aio_context_acquire(aio_context);
1931
1932 assert(state->job);
1933 job_start(&state->job->job);
1934
1935 aio_context_release(aio_context);
1936 }
1937
1938 static void blockdev_backup_abort(void *opaque)
1939 {
1940 BlockdevBackupState *state = opaque;
1941
1942 if (state->job) {
1943 job_cancel_sync(&state->job->job, true);
1944 }
1945 }
1946
1947 static void blockdev_backup_clean(void *opaque)
1948 {
1949 g_autofree BlockdevBackupState *state = opaque;
1950 AioContext *aio_context;
1951
1952 if (!state->bs) {
1953 return;
1954 }
1955
1956 aio_context = bdrv_get_aio_context(state->bs);
1957 aio_context_acquire(aio_context);
1958
1959 bdrv_drained_end(state->bs);
1960
1961 aio_context_release(aio_context);
1962 }
1963
1964 typedef struct BlockDirtyBitmapState {
1965 BdrvDirtyBitmap *bitmap;
1966 BlockDriverState *bs;
1967 HBitmap *backup;
1968 bool was_enabled;
1969 } BlockDirtyBitmapState;
1970
1971 static void block_dirty_bitmap_add_abort(void *opaque);
1972 TransactionActionDrv block_dirty_bitmap_add_drv = {
1973 .abort = block_dirty_bitmap_add_abort,
1974 .clean = g_free,
1975 };
1976
1977 static void block_dirty_bitmap_add_action(BlockDirtyBitmapAdd *action,
1978 Transaction *tran, Error **errp)
1979 {
1980 Error *local_err = NULL;
1981 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
1982
1983 tran_add(tran, &block_dirty_bitmap_add_drv, state);
1984
1985 /* AIO context taken and released within qmp_block_dirty_bitmap_add */
1986 qmp_block_dirty_bitmap_add(action->node, action->name,
1987 action->has_granularity, action->granularity,
1988 action->has_persistent, action->persistent,
1989 action->has_disabled, action->disabled,
1990 &local_err);
1991
1992 if (!local_err) {
1993 state->bitmap = block_dirty_bitmap_lookup(action->node, action->name,
1994 NULL, &error_abort);
1995 } else {
1996 error_propagate(errp, local_err);
1997 }
1998 }
1999
2000 static void block_dirty_bitmap_add_abort(void *opaque)
2001 {
2002 BlockDirtyBitmapState *state = opaque;
2003
2004 if (state->bitmap) {
2005 bdrv_release_dirty_bitmap(state->bitmap);
2006 }
2007 }
2008
2009 static void block_dirty_bitmap_restore(void *opaque);
2010 static void block_dirty_bitmap_free_backup(void *opaque);
2011 TransactionActionDrv block_dirty_bitmap_clear_drv = {
2012 .abort = block_dirty_bitmap_restore,
2013 .commit = block_dirty_bitmap_free_backup,
2014 .clean = g_free,
2015 };
2016
2017 static void block_dirty_bitmap_clear_action(BlockDirtyBitmap *action,
2018 Transaction *tran, Error **errp)
2019 {
2020 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2021
2022 tran_add(tran, &block_dirty_bitmap_clear_drv, state);
2023
2024 state->bitmap = block_dirty_bitmap_lookup(action->node,
2025 action->name,
2026 &state->bs,
2027 errp);
2028 if (!state->bitmap) {
2029 return;
2030 }
2031
2032 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_DEFAULT, errp)) {
2033 return;
2034 }
2035
2036 bdrv_clear_dirty_bitmap(state->bitmap, &state->backup);
2037 }
2038
2039 static void block_dirty_bitmap_restore(void *opaque)
2040 {
2041 BlockDirtyBitmapState *state = opaque;
2042
2043 if (state->backup) {
2044 bdrv_restore_dirty_bitmap(state->bitmap, state->backup);
2045 }
2046 }
2047
2048 static void block_dirty_bitmap_free_backup(void *opaque)
2049 {
2050 BlockDirtyBitmapState *state = opaque;
2051
2052 hbitmap_free(state->backup);
2053 }
2054
2055 static void block_dirty_bitmap_enable_abort(void *opaque);
2056 TransactionActionDrv block_dirty_bitmap_enable_drv = {
2057 .abort = block_dirty_bitmap_enable_abort,
2058 .clean = g_free,
2059 };
2060
2061 static void block_dirty_bitmap_enable_action(BlockDirtyBitmap *action,
2062 Transaction *tran, Error **errp)
2063 {
2064 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2065
2066 tran_add(tran, &block_dirty_bitmap_enable_drv, state);
2067
2068 state->bitmap = block_dirty_bitmap_lookup(action->node,
2069 action->name,
2070 NULL,
2071 errp);
2072 if (!state->bitmap) {
2073 return;
2074 }
2075
2076 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2077 return;
2078 }
2079
2080 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2081 bdrv_enable_dirty_bitmap(state->bitmap);
2082 }
2083
2084 static void block_dirty_bitmap_enable_abort(void *opaque)
2085 {
2086 BlockDirtyBitmapState *state = opaque;
2087
2088 if (!state->was_enabled) {
2089 bdrv_disable_dirty_bitmap(state->bitmap);
2090 }
2091 }
2092
2093 static void block_dirty_bitmap_disable_abort(void *opaque);
2094 TransactionActionDrv block_dirty_bitmap_disable_drv = {
2095 .abort = block_dirty_bitmap_disable_abort,
2096 .clean = g_free,
2097 };
2098
2099 static void block_dirty_bitmap_disable_action(BlockDirtyBitmap *action,
2100 Transaction *tran, Error **errp)
2101 {
2102 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2103
2104 tran_add(tran, &block_dirty_bitmap_disable_drv, state);
2105
2106 state->bitmap = block_dirty_bitmap_lookup(action->node,
2107 action->name,
2108 NULL,
2109 errp);
2110 if (!state->bitmap) {
2111 return;
2112 }
2113
2114 if (bdrv_dirty_bitmap_check(state->bitmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2115 return;
2116 }
2117
2118 state->was_enabled = bdrv_dirty_bitmap_enabled(state->bitmap);
2119 bdrv_disable_dirty_bitmap(state->bitmap);
2120 }
2121
2122 static void block_dirty_bitmap_disable_abort(void *opaque)
2123 {
2124 BlockDirtyBitmapState *state = opaque;
2125
2126 if (state->was_enabled) {
2127 bdrv_enable_dirty_bitmap(state->bitmap);
2128 }
2129 }
2130
2131 TransactionActionDrv block_dirty_bitmap_merge_drv = {
2132 .commit = block_dirty_bitmap_free_backup,
2133 .abort = block_dirty_bitmap_restore,
2134 .clean = g_free,
2135 };
2136
2137 static void block_dirty_bitmap_merge_action(BlockDirtyBitmapMerge *action,
2138 Transaction *tran, Error **errp)
2139 {
2140 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2141
2142 tran_add(tran, &block_dirty_bitmap_merge_drv, state);
2143
2144 state->bitmap = block_dirty_bitmap_merge(action->node, action->target,
2145 action->bitmaps, &state->backup,
2146 errp);
2147 }
2148
2149 static void block_dirty_bitmap_remove_commit(void *opaque);
2150 static void block_dirty_bitmap_remove_abort(void *opaque);
2151 TransactionActionDrv block_dirty_bitmap_remove_drv = {
2152 .commit = block_dirty_bitmap_remove_commit,
2153 .abort = block_dirty_bitmap_remove_abort,
2154 .clean = g_free,
2155 };
2156
2157 static void block_dirty_bitmap_remove_action(BlockDirtyBitmap *action,
2158 Transaction *tran, Error **errp)
2159 {
2160 BlockDirtyBitmapState *state = g_new0(BlockDirtyBitmapState, 1);
2161
2162 tran_add(tran, &block_dirty_bitmap_remove_drv, state);
2163
2164
2165 state->bitmap = block_dirty_bitmap_remove(action->node, action->name,
2166 false, &state->bs, errp);
2167 if (state->bitmap) {
2168 bdrv_dirty_bitmap_skip_store(state->bitmap, true);
2169 bdrv_dirty_bitmap_set_busy(state->bitmap, true);
2170 }
2171 }
2172
2173 static void block_dirty_bitmap_remove_abort(void *opaque)
2174 {
2175 BlockDirtyBitmapState *state = opaque;
2176
2177 if (state->bitmap) {
2178 bdrv_dirty_bitmap_skip_store(state->bitmap, false);
2179 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2180 }
2181 }
2182
2183 static void block_dirty_bitmap_remove_commit(void *opaque)
2184 {
2185 BlockDirtyBitmapState *state = opaque;
2186
2187 bdrv_dirty_bitmap_set_busy(state->bitmap, false);
2188 bdrv_release_dirty_bitmap(state->bitmap);
2189 }
2190
2191 static void abort_commit(void *opaque);
2192 TransactionActionDrv abort_drv = {
2193 .commit = abort_commit,
2194 };
2195
2196 static void abort_action(Transaction *tran, Error **errp)
2197 {
2198 tran_add(tran, &abort_drv, NULL);
2199 error_setg(errp, "Transaction aborted using Abort action");
2200 }
2201
2202 static void abort_commit(void *opaque)
2203 {
2204 g_assert_not_reached(); /* this action never succeeds */
2205 }
2206
2207 static void transaction_action(TransactionAction *act, JobTxn *block_job_txn,
2208 Transaction *tran, Error **errp)
2209 {
2210 switch (act->type) {
2211 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
2212 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
2213 external_snapshot_action(act, tran, errp);
2214 return;
2215 case TRANSACTION_ACTION_KIND_DRIVE_BACKUP:
2216 drive_backup_action(act->u.drive_backup.data,
2217 block_job_txn, tran, errp);
2218 return;
2219 case TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP:
2220 blockdev_backup_action(act->u.blockdev_backup.data,
2221 block_job_txn, tran, errp);
2222 return;
2223 case TRANSACTION_ACTION_KIND_ABORT:
2224 abort_action(tran, errp);
2225 return;
2226 case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC:
2227 internal_snapshot_action(act->u.blockdev_snapshot_internal_sync.data,
2228 tran, errp);
2229 return;
2230 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ADD:
2231 block_dirty_bitmap_add_action(act->u.block_dirty_bitmap_add.data,
2232 tran, errp);
2233 return;
2234 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_CLEAR:
2235 block_dirty_bitmap_clear_action(act->u.block_dirty_bitmap_clear.data,
2236 tran, errp);
2237 return;
2238 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_ENABLE:
2239 block_dirty_bitmap_enable_action(act->u.block_dirty_bitmap_enable.data,
2240 tran, errp);
2241 return;
2242 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_DISABLE:
2243 block_dirty_bitmap_disable_action(
2244 act->u.block_dirty_bitmap_disable.data, tran, errp);
2245 return;
2246 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_MERGE:
2247 block_dirty_bitmap_merge_action(act->u.block_dirty_bitmap_merge.data,
2248 tran, errp);
2249 return;
2250 case TRANSACTION_ACTION_KIND_BLOCK_DIRTY_BITMAP_REMOVE:
2251 block_dirty_bitmap_remove_action(act->u.block_dirty_bitmap_remove.data,
2252 tran, errp);
2253 return;
2254 /*
2255 * Where are transactions for MIRROR, COMMIT and STREAM?
2256 * Although these blockjobs use transaction callbacks like the backup job,
2257 * these jobs do not necessarily adhere to transaction semantics.
2258 * These jobs may not fully undo all of their actions on abort, nor do they
2259 * necessarily work in transactions with more than one job in them.
2260 */
2261 case TRANSACTION_ACTION_KIND__MAX:
2262 default:
2263 g_assert_not_reached();
2264 };
2265 }
2266
2267
2268 /*
2269 * 'Atomic' group operations. The operations are performed as a set, and if
2270 * any fail then we roll back all operations in the group.
2271 *
2272 * Always run under BQL.
2273 */
2274 void qmp_transaction(TransactionActionList *actions,
2275 struct TransactionProperties *properties,
2276 Error **errp)
2277 {
2278 TransactionActionList *act;
2279 JobTxn *block_job_txn = NULL;
2280 Error *local_err = NULL;
2281 Transaction *tran;
2282 ActionCompletionMode comp_mode =
2283 properties ? properties->completion_mode :
2284 ACTION_COMPLETION_MODE_INDIVIDUAL;
2285
2286 GLOBAL_STATE_CODE();
2287
2288 /* Does this transaction get canceled as a group on failure?
2289 * If not, we don't really need to make a JobTxn.
2290 */
2291 if (comp_mode != ACTION_COMPLETION_MODE_INDIVIDUAL) {
2292 for (act = actions; act; act = act->next) {
2293 TransactionActionKind type = act->value->type;
2294
2295 if (type != TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP &&
2296 type != TRANSACTION_ACTION_KIND_DRIVE_BACKUP)
2297 {
2298 error_setg(errp,
2299 "Action '%s' does not support transaction property "
2300 "completion-mode = %s",
2301 TransactionActionKind_str(type),
2302 ActionCompletionMode_str(comp_mode));
2303 return;
2304 }
2305 }
2306
2307 block_job_txn = job_txn_new();
2308 }
2309
2310 /* drain all i/o before any operations */
2311 bdrv_drain_all();
2312
2313 tran = tran_new();
2314
2315 /* We don't do anything in this loop that commits us to the operations */
2316 for (act = actions; act; act = act->next) {
2317 transaction_action(act->value, block_job_txn, tran, &local_err);
2318 if (local_err) {
2319 error_propagate(errp, local_err);
2320 goto delete_and_fail;
2321 }
2322 }
2323
2324 tran_commit(tran);
2325
2326 /* success */
2327 goto exit;
2328
2329 delete_and_fail:
2330 /* failure, and it is all-or-none; roll back all operations */
2331 tran_abort(tran);
2332 exit:
2333 job_txn_unref(block_job_txn);
2334 }
2335
2336 BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node,
2337 const char *name,
2338 Error **errp)
2339 {
2340 BdrvDirtyBitmap *bitmap;
2341 BlockDriverState *bs;
2342 BlockDirtyBitmapSha256 *ret = NULL;
2343 char *sha256;
2344
2345 bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp);
2346 if (!bitmap || !bs) {
2347 return NULL;
2348 }
2349
2350 sha256 = bdrv_dirty_bitmap_sha256(bitmap, errp);
2351 if (sha256 == NULL) {
2352 return NULL;
2353 }
2354
2355 ret = g_new(BlockDirtyBitmapSha256, 1);
2356 ret->sha256 = sha256;
2357
2358 return ret;
2359 }
2360
2361 void coroutine_fn qmp_block_resize(const char *device, const char *node_name,
2362 int64_t size, Error **errp)
2363 {
2364 Error *local_err = NULL;
2365 BlockBackend *blk;
2366 BlockDriverState *bs;
2367 AioContext *old_ctx;
2368
2369 bs = bdrv_lookup_bs(device, node_name, &local_err);
2370 if (local_err) {
2371 error_propagate(errp, local_err);
2372 return;
2373 }
2374
2375 if (size < 0) {
2376 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size");
2377 return;
2378 }
2379
2380 bdrv_graph_co_rdlock();
2381 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_RESIZE, NULL)) {
2382 error_setg(errp, QERR_DEVICE_IN_USE, device);
2383 bdrv_graph_co_rdunlock();
2384 return;
2385 }
2386 bdrv_graph_co_rdunlock();
2387
2388 blk = blk_co_new_with_bs(bs, BLK_PERM_RESIZE, BLK_PERM_ALL, errp);
2389 if (!blk) {
2390 return;
2391 }
2392
2393 bdrv_co_lock(bs);
2394 bdrv_drained_begin(bs);
2395 bdrv_co_unlock(bs);
2396
2397 old_ctx = bdrv_co_enter(bs);
2398 blk_co_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp);
2399 bdrv_co_leave(bs, old_ctx);
2400
2401 bdrv_co_lock(bs);
2402 bdrv_drained_end(bs);
2403 bdrv_co_unlock(bs);
2404
2405 blk_co_unref(blk);
2406 }
2407
2408 void qmp_block_stream(const char *job_id, const char *device,
2409 const char *base,
2410 const char *base_node,
2411 const char *backing_file,
2412 const char *bottom,
2413 bool has_speed, int64_t speed,
2414 bool has_on_error, BlockdevOnError on_error,
2415 const char *filter_node_name,
2416 bool has_auto_finalize, bool auto_finalize,
2417 bool has_auto_dismiss, bool auto_dismiss,
2418 Error **errp)
2419 {
2420 BlockDriverState *bs, *iter, *iter_end;
2421 BlockDriverState *base_bs = NULL;
2422 BlockDriverState *bottom_bs = NULL;
2423 AioContext *aio_context;
2424 Error *local_err = NULL;
2425 int job_flags = JOB_DEFAULT;
2426
2427 GLOBAL_STATE_CODE();
2428
2429 if (base && base_node) {
2430 error_setg(errp, "'base' and 'base-node' cannot be specified "
2431 "at the same time");
2432 return;
2433 }
2434
2435 if (base && bottom) {
2436 error_setg(errp, "'base' and 'bottom' cannot be specified "
2437 "at the same time");
2438 return;
2439 }
2440
2441 if (bottom && base_node) {
2442 error_setg(errp, "'bottom' and 'base-node' cannot be specified "
2443 "at the same time");
2444 return;
2445 }
2446
2447 if (!has_on_error) {
2448 on_error = BLOCKDEV_ON_ERROR_REPORT;
2449 }
2450
2451 bs = bdrv_lookup_bs(device, device, errp);
2452 if (!bs) {
2453 return;
2454 }
2455
2456 aio_context = bdrv_get_aio_context(bs);
2457 aio_context_acquire(aio_context);
2458
2459 bdrv_graph_rdlock_main_loop();
2460 if (base) {
2461 base_bs = bdrv_find_backing_image(bs, base);
2462 if (base_bs == NULL) {
2463 error_setg(errp, "Can't find '%s' in the backing chain", base);
2464 goto out_rdlock;
2465 }
2466 assert(bdrv_get_aio_context(base_bs) == aio_context);
2467 }
2468
2469 if (base_node) {
2470 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2471 if (!base_bs) {
2472 goto out_rdlock;
2473 }
2474 if (bs == base_bs || !bdrv_chain_contains(bs, base_bs)) {
2475 error_setg(errp, "Node '%s' is not a backing image of '%s'",
2476 base_node, device);
2477 goto out_rdlock;
2478 }
2479 assert(bdrv_get_aio_context(base_bs) == aio_context);
2480
2481 bdrv_refresh_filename(base_bs);
2482 }
2483
2484 if (bottom) {
2485 bottom_bs = bdrv_lookup_bs(NULL, bottom, errp);
2486 if (!bottom_bs) {
2487 goto out_rdlock;
2488 }
2489 if (!bottom_bs->drv) {
2490 error_setg(errp, "Node '%s' is not open", bottom);
2491 goto out_rdlock;
2492 }
2493 if (bottom_bs->drv->is_filter) {
2494 error_setg(errp, "Node '%s' is a filter, use a non-filter node "
2495 "as 'bottom'", bottom);
2496 goto out_rdlock;
2497 }
2498 if (!bdrv_chain_contains(bs, bottom_bs)) {
2499 error_setg(errp, "Node '%s' is not in a chain starting from '%s'",
2500 bottom, device);
2501 goto out_rdlock;
2502 }
2503 assert(bdrv_get_aio_context(bottom_bs) == aio_context);
2504 }
2505
2506 /*
2507 * Check for op blockers in the whole chain between bs and base (or bottom)
2508 */
2509 iter_end = bottom ? bdrv_filter_or_cow_bs(bottom_bs) : base_bs;
2510 for (iter = bs; iter && iter != iter_end;
2511 iter = bdrv_filter_or_cow_bs(iter))
2512 {
2513 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_STREAM, errp)) {
2514 goto out_rdlock;
2515 }
2516 }
2517 bdrv_graph_rdunlock_main_loop();
2518
2519 /* if we are streaming the entire chain, the result will have no backing
2520 * file, and specifying one is therefore an error */
2521 if (!base_bs && backing_file) {
2522 error_setg(errp, "backing file specified, but streaming the "
2523 "entire chain");
2524 goto out;
2525 }
2526
2527 if (has_auto_finalize && !auto_finalize) {
2528 job_flags |= JOB_MANUAL_FINALIZE;
2529 }
2530 if (has_auto_dismiss && !auto_dismiss) {
2531 job_flags |= JOB_MANUAL_DISMISS;
2532 }
2533
2534 stream_start(job_id, bs, base_bs, backing_file,
2535 bottom_bs, job_flags, has_speed ? speed : 0, on_error,
2536 filter_node_name, &local_err);
2537 if (local_err) {
2538 error_propagate(errp, local_err);
2539 goto out;
2540 }
2541
2542 trace_qmp_block_stream(bs);
2543
2544 out:
2545 aio_context_release(aio_context);
2546 return;
2547
2548 out_rdlock:
2549 bdrv_graph_rdunlock_main_loop();
2550 aio_context_release(aio_context);
2551 }
2552
2553 void qmp_block_commit(const char *job_id, const char *device,
2554 const char *base_node,
2555 const char *base,
2556 const char *top_node,
2557 const char *top,
2558 const char *backing_file,
2559 bool has_speed, int64_t speed,
2560 bool has_on_error, BlockdevOnError on_error,
2561 const char *filter_node_name,
2562 bool has_auto_finalize, bool auto_finalize,
2563 bool has_auto_dismiss, bool auto_dismiss,
2564 Error **errp)
2565 {
2566 BlockDriverState *bs;
2567 BlockDriverState *iter;
2568 BlockDriverState *base_bs, *top_bs;
2569 AioContext *aio_context;
2570 Error *local_err = NULL;
2571 int job_flags = JOB_DEFAULT;
2572 uint64_t top_perm, top_shared;
2573
2574 /* TODO We'll eventually have to take a writer lock in this function */
2575 GRAPH_RDLOCK_GUARD_MAINLOOP();
2576
2577 if (!has_speed) {
2578 speed = 0;
2579 }
2580 if (!has_on_error) {
2581 on_error = BLOCKDEV_ON_ERROR_REPORT;
2582 }
2583 if (has_auto_finalize && !auto_finalize) {
2584 job_flags |= JOB_MANUAL_FINALIZE;
2585 }
2586 if (has_auto_dismiss && !auto_dismiss) {
2587 job_flags |= JOB_MANUAL_DISMISS;
2588 }
2589
2590 /* Important Note:
2591 * libvirt relies on the DeviceNotFound error class in order to probe for
2592 * live commit feature versions; for this to work, we must make sure to
2593 * perform the device lookup before any generic errors that may occur in a
2594 * scenario in which all optional arguments are omitted. */
2595 bs = qmp_get_root_bs(device, &local_err);
2596 if (!bs) {
2597 bs = bdrv_lookup_bs(device, device, NULL);
2598 if (!bs) {
2599 error_free(local_err);
2600 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
2601 "Device '%s' not found", device);
2602 } else {
2603 error_propagate(errp, local_err);
2604 }
2605 return;
2606 }
2607
2608 aio_context = bdrv_get_aio_context(bs);
2609 aio_context_acquire(aio_context);
2610
2611 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
2612 goto out;
2613 }
2614
2615 /* default top_bs is the active layer */
2616 top_bs = bs;
2617
2618 if (top_node && top) {
2619 error_setg(errp, "'top-node' and 'top' are mutually exclusive");
2620 goto out;
2621 } else if (top_node) {
2622 top_bs = bdrv_lookup_bs(NULL, top_node, errp);
2623 if (top_bs == NULL) {
2624 goto out;
2625 }
2626 if (!bdrv_chain_contains(bs, top_bs)) {
2627 error_setg(errp, "'%s' is not in this backing file chain",
2628 top_node);
2629 goto out;
2630 }
2631 } else if (top) {
2632 /* This strcmp() is just a shortcut, there is no need to
2633 * refresh @bs's filename. If it mismatches,
2634 * bdrv_find_backing_image() will do the refresh and may still
2635 * return @bs. */
2636 if (strcmp(bs->filename, top) != 0) {
2637 top_bs = bdrv_find_backing_image(bs, top);
2638 }
2639 }
2640
2641 if (top_bs == NULL) {
2642 error_setg(errp, "Top image file %s not found", top ? top : "NULL");
2643 goto out;
2644 }
2645
2646 assert(bdrv_get_aio_context(top_bs) == aio_context);
2647
2648 if (base_node && base) {
2649 error_setg(errp, "'base-node' and 'base' are mutually exclusive");
2650 goto out;
2651 } else if (base_node) {
2652 base_bs = bdrv_lookup_bs(NULL, base_node, errp);
2653 if (base_bs == NULL) {
2654 goto out;
2655 }
2656 if (!bdrv_chain_contains(top_bs, base_bs)) {
2657 error_setg(errp, "'%s' is not in this backing file chain",
2658 base_node);
2659 goto out;
2660 }
2661 } else if (base) {
2662 base_bs = bdrv_find_backing_image(top_bs, base);
2663 if (base_bs == NULL) {
2664 error_setg(errp, "Can't find '%s' in the backing chain", base);
2665 goto out;
2666 }
2667 } else {
2668 base_bs = bdrv_find_base(top_bs);
2669 if (base_bs == NULL) {
2670 error_setg(errp, "There is no backimg image");
2671 goto out;
2672 }
2673 }
2674
2675 assert(bdrv_get_aio_context(base_bs) == aio_context);
2676
2677 for (iter = top_bs; iter != bdrv_filter_or_cow_bs(base_bs);
2678 iter = bdrv_filter_or_cow_bs(iter))
2679 {
2680 if (bdrv_op_is_blocked(iter, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2681 goto out;
2682 }
2683 }
2684
2685 /* Do not allow attempts to commit an image into itself */
2686 if (top_bs == base_bs) {
2687 error_setg(errp, "cannot commit an image into itself");
2688 goto out;
2689 }
2690
2691 /*
2692 * Active commit is required if and only if someone has taken a
2693 * WRITE permission on the top node. Historically, we have always
2694 * used active commit for top nodes, so continue that practice
2695 * lest we possibly break clients that rely on this behavior, e.g.
2696 * to later attach this node to a writing parent.
2697 * (Active commit is never really wrong.)
2698 */
2699 bdrv_get_cumulative_perm(top_bs, &top_perm, &top_shared);
2700 if (top_perm & BLK_PERM_WRITE ||
2701 bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs))
2702 {
2703 if (backing_file) {
2704 if (bdrv_skip_filters(top_bs) == bdrv_skip_filters(bs)) {
2705 error_setg(errp, "'backing-file' specified,"
2706 " but 'top' is the active layer");
2707 } else {
2708 error_setg(errp, "'backing-file' specified, but 'top' has a "
2709 "writer on it");
2710 }
2711 goto out;
2712 }
2713 if (!job_id) {
2714 /*
2715 * Emulate here what block_job_create() does, because it
2716 * is possible that @bs != @top_bs (the block job should
2717 * be named after @bs, even if @top_bs is the actual
2718 * source)
2719 */
2720 job_id = bdrv_get_device_name(bs);
2721 }
2722 commit_active_start(job_id, top_bs, base_bs, job_flags, speed, on_error,
2723 filter_node_name, NULL, NULL, false, &local_err);
2724 } else {
2725 BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
2726 if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
2727 goto out;
2728 }
2729 commit_start(job_id, bs, base_bs, top_bs, job_flags,
2730 speed, on_error, backing_file,
2731 filter_node_name, &local_err);
2732 }
2733 if (local_err != NULL) {
2734 error_propagate(errp, local_err);
2735 goto out;
2736 }
2737
2738 out:
2739 aio_context_release(aio_context);
2740 }
2741
2742 /* Common QMP interface for drive-backup and blockdev-backup */
2743 static BlockJob *do_backup_common(BackupCommon *backup,
2744 BlockDriverState *bs,
2745 BlockDriverState *target_bs,
2746 AioContext *aio_context,
2747 JobTxn *txn, Error **errp)
2748 {
2749 BlockJob *job = NULL;
2750 BdrvDirtyBitmap *bmap = NULL;
2751 BackupPerf perf = { .max_workers = 64 };
2752 int job_flags = JOB_DEFAULT;
2753
2754 if (!backup->has_speed) {
2755 backup->speed = 0;
2756 }
2757 if (!backup->has_on_source_error) {
2758 backup->on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2759 }
2760 if (!backup->has_on_target_error) {
2761 backup->on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2762 }
2763 if (!backup->has_auto_finalize) {
2764 backup->auto_finalize = true;
2765 }
2766 if (!backup->has_auto_dismiss) {
2767 backup->auto_dismiss = true;
2768 }
2769 if (!backup->has_compress) {
2770 backup->compress = false;
2771 }
2772
2773 if (backup->x_perf) {
2774 if (backup->x_perf->has_use_copy_range) {
2775 perf.use_copy_range = backup->x_perf->use_copy_range;
2776 }
2777 if (backup->x_perf->has_max_workers) {
2778 perf.max_workers = backup->x_perf->max_workers;
2779 }
2780 if (backup->x_perf->has_max_chunk) {
2781 perf.max_chunk = backup->x_perf->max_chunk;
2782 }
2783 }
2784
2785 if ((backup->sync == MIRROR_SYNC_MODE_BITMAP) ||
2786 (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL)) {
2787 /* done before desugaring 'incremental' to print the right message */
2788 if (!backup->bitmap) {
2789 error_setg(errp, "must provide a valid bitmap name for "
2790 "'%s' sync mode", MirrorSyncMode_str(backup->sync));
2791 return NULL;
2792 }
2793 }
2794
2795 if (backup->sync == MIRROR_SYNC_MODE_INCREMENTAL) {
2796 if (backup->has_bitmap_mode &&
2797 backup->bitmap_mode != BITMAP_SYNC_MODE_ON_SUCCESS) {
2798 error_setg(errp, "Bitmap sync mode must be '%s' "
2799 "when using sync mode '%s'",
2800 BitmapSyncMode_str(BITMAP_SYNC_MODE_ON_SUCCESS),
2801 MirrorSyncMode_str(backup->sync));
2802 return NULL;
2803 }
2804 backup->has_bitmap_mode = true;
2805 backup->sync = MIRROR_SYNC_MODE_BITMAP;
2806 backup->bitmap_mode = BITMAP_SYNC_MODE_ON_SUCCESS;
2807 }
2808
2809 if (backup->bitmap) {
2810 bmap = bdrv_find_dirty_bitmap(bs, backup->bitmap);
2811 if (!bmap) {
2812 error_setg(errp, "Bitmap '%s' could not be found", backup->bitmap);
2813 return NULL;
2814 }
2815 if (!backup->has_bitmap_mode) {
2816 error_setg(errp, "Bitmap sync mode must be given "
2817 "when providing a bitmap");
2818 return NULL;
2819 }
2820 if (bdrv_dirty_bitmap_check(bmap, BDRV_BITMAP_ALLOW_RO, errp)) {
2821 return NULL;
2822 }
2823
2824 /* This does not produce a useful bitmap artifact: */
2825 if (backup->sync == MIRROR_SYNC_MODE_NONE) {
2826 error_setg(errp, "sync mode '%s' does not produce meaningful bitmap"
2827 " outputs", MirrorSyncMode_str(backup->sync));
2828 return NULL;
2829 }
2830
2831 /* If the bitmap isn't used for input or output, this is useless: */
2832 if (backup->bitmap_mode == BITMAP_SYNC_MODE_NEVER &&
2833 backup->sync != MIRROR_SYNC_MODE_BITMAP) {
2834 error_setg(errp, "Bitmap sync mode '%s' has no meaningful effect"
2835 " when combined with sync mode '%s'",
2836 BitmapSyncMode_str(backup->bitmap_mode),
2837 MirrorSyncMode_str(backup->sync));
2838 return NULL;
2839 }
2840 }
2841
2842 if (!backup->bitmap && backup->has_bitmap_mode) {
2843 error_setg(errp, "Cannot specify bitmap sync mode without a bitmap");
2844 return NULL;
2845 }
2846
2847 if (!backup->auto_finalize) {
2848 job_flags |= JOB_MANUAL_FINALIZE;
2849 }
2850 if (!backup->auto_dismiss) {
2851 job_flags |= JOB_MANUAL_DISMISS;
2852 }
2853
2854 job = backup_job_create(backup->job_id, bs, target_bs, backup->speed,
2855 backup->sync, bmap, backup->bitmap_mode,
2856 backup->compress,
2857 backup->filter_node_name,
2858 &perf,
2859 backup->on_source_error,
2860 backup->on_target_error,
2861 job_flags, NULL, NULL, txn, errp);
2862 return job;
2863 }
2864
2865 void qmp_drive_backup(DriveBackup *backup, Error **errp)
2866 {
2867 TransactionAction action = {
2868 .type = TRANSACTION_ACTION_KIND_DRIVE_BACKUP,
2869 .u.drive_backup.data = backup,
2870 };
2871 blockdev_do_action(&action, errp);
2872 }
2873
2874 BlockDeviceInfoList *qmp_query_named_block_nodes(bool has_flat,
2875 bool flat,
2876 Error **errp)
2877 {
2878 bool return_flat = has_flat && flat;
2879
2880 return bdrv_named_nodes_list(return_flat, errp);
2881 }
2882
2883 XDbgBlockGraph *qmp_x_debug_query_block_graph(Error **errp)
2884 {
2885 GRAPH_RDLOCK_GUARD_MAINLOOP();
2886
2887 return bdrv_get_xdbg_block_graph(errp);
2888 }
2889
2890 void qmp_blockdev_backup(BlockdevBackup *backup, Error **errp)
2891 {
2892 TransactionAction action = {
2893 .type = TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP,
2894 .u.blockdev_backup.data = backup,
2895 };
2896 blockdev_do_action(&action, errp);
2897 }
2898
2899 /* Parameter check and block job starting for drive mirroring.
2900 * Caller should hold @device and @target's aio context (must be the same).
2901 **/
2902 static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
2903 BlockDriverState *target,
2904 const char *replaces,
2905 enum MirrorSyncMode sync,
2906 BlockMirrorBackingMode backing_mode,
2907 bool zero_target,
2908 bool has_speed, int64_t speed,
2909 bool has_granularity, uint32_t granularity,
2910 bool has_buf_size, int64_t buf_size,
2911 bool has_on_source_error,
2912 BlockdevOnError on_source_error,
2913 bool has_on_target_error,
2914 BlockdevOnError on_target_error,
2915 bool has_unmap, bool unmap,
2916 const char *filter_node_name,
2917 bool has_copy_mode, MirrorCopyMode copy_mode,
2918 bool has_auto_finalize, bool auto_finalize,
2919 bool has_auto_dismiss, bool auto_dismiss,
2920 Error **errp)
2921 {
2922 BlockDriverState *unfiltered_bs;
2923 int job_flags = JOB_DEFAULT;
2924
2925 GLOBAL_STATE_CODE();
2926 GRAPH_RDLOCK_GUARD_MAINLOOP();
2927
2928 if (!has_speed) {
2929 speed = 0;
2930 }
2931 if (!has_on_source_error) {
2932 on_source_error = BLOCKDEV_ON_ERROR_REPORT;
2933 }
2934 if (!has_on_target_error) {
2935 on_target_error = BLOCKDEV_ON_ERROR_REPORT;
2936 }
2937 if (!has_granularity) {
2938 granularity = 0;
2939 }
2940 if (!has_buf_size) {
2941 buf_size = 0;
2942 }
2943 if (!has_unmap) {
2944 unmap = true;
2945 }
2946 if (!has_copy_mode) {
2947 copy_mode = MIRROR_COPY_MODE_BACKGROUND;
2948 }
2949 if (has_auto_finalize && !auto_finalize) {
2950 job_flags |= JOB_MANUAL_FINALIZE;
2951 }
2952 if (has_auto_dismiss && !auto_dismiss) {
2953 job_flags |= JOB_MANUAL_DISMISS;
2954 }
2955
2956 if (granularity != 0 && (granularity < 512 || granularity > 1048576 * 64)) {
2957 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2958 "a value in range [512B, 64MB]");
2959 return;
2960 }
2961 if (granularity & (granularity - 1)) {
2962 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
2963 "a power of 2");
2964 return;
2965 }
2966
2967 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
2968 return;
2969 }
2970 if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_MIRROR_TARGET, errp)) {
2971 return;
2972 }
2973
2974 if (!bdrv_backing_chain_next(bs) && sync == MIRROR_SYNC_MODE_TOP) {
2975 sync = MIRROR_SYNC_MODE_FULL;
2976 }
2977
2978 if (!replaces) {
2979 /* We want to mirror from @bs, but keep implicit filters on top */
2980 unfiltered_bs = bdrv_skip_implicit_filters(bs);
2981 if (unfiltered_bs != bs) {
2982 replaces = unfiltered_bs->node_name;
2983 }
2984 }
2985
2986 if (replaces) {
2987 BlockDriverState *to_replace_bs;
2988 AioContext *aio_context;
2989 AioContext *replace_aio_context;
2990 int64_t bs_size, replace_size;
2991
2992 bs_size = bdrv_getlength(bs);
2993 if (bs_size < 0) {
2994 error_setg_errno(errp, -bs_size, "Failed to query device's size");
2995 return;
2996 }
2997
2998 to_replace_bs = check_to_replace_node(bs, replaces, errp);
2999 if (!to_replace_bs) {
3000 return;
3001 }
3002
3003 aio_context = bdrv_get_aio_context(bs);
3004 replace_aio_context = bdrv_get_aio_context(to_replace_bs);
3005 /*
3006 * bdrv_getlength() is a co-wrapper and uses AIO_WAIT_WHILE. Be sure not
3007 * to acquire the same AioContext twice.
3008 */
3009 if (replace_aio_context != aio_context) {
3010 aio_context_acquire(replace_aio_context);
3011 }
3012 replace_size = bdrv_getlength(to_replace_bs);
3013 if (replace_aio_context != aio_context) {
3014 aio_context_release(replace_aio_context);
3015 }
3016
3017 if (replace_size < 0) {
3018 error_setg_errno(errp, -replace_size,
3019 "Failed to query the replacement node's size");
3020 return;
3021 }
3022 if (bs_size != replace_size) {
3023 error_setg(errp, "cannot replace image with a mirror image of "
3024 "different size");
3025 return;
3026 }
3027 }
3028
3029 /* pass the node name to replace to mirror start since it's loose coupling
3030 * and will allow to check whether the node still exist at mirror completion
3031 */
3032 mirror_start(job_id, bs, target,
3033 replaces, job_flags,
3034 speed, granularity, buf_size, sync, backing_mode, zero_target,
3035 on_source_error, on_target_error, unmap, filter_node_name,
3036 copy_mode, errp);
3037 }
3038
3039 void qmp_drive_mirror(DriveMirror *arg, Error **errp)
3040 {
3041 BlockDriverState *bs;
3042 BlockDriverState *target_backing_bs, *target_bs;
3043 AioContext *aio_context;
3044 AioContext *old_context;
3045 BlockMirrorBackingMode backing_mode;
3046 Error *local_err = NULL;
3047 QDict *options = NULL;
3048 int flags;
3049 int64_t size;
3050 const char *format = arg->format;
3051 bool zero_target;
3052 int ret;
3053
3054 bs = qmp_get_root_bs(arg->device, errp);
3055 if (!bs) {
3056 return;
3057 }
3058
3059 /* Early check to avoid creating target */
3060 bdrv_graph_rdlock_main_loop();
3061 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
3062 bdrv_graph_rdunlock_main_loop();
3063 return;
3064 }
3065
3066 aio_context = bdrv_get_aio_context(bs);
3067 aio_context_acquire(aio_context);
3068
3069 if (!arg->has_mode) {
3070 arg->mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
3071 }
3072
3073 if (!arg->format) {
3074 format = (arg->mode == NEW_IMAGE_MODE_EXISTING
3075 ? NULL : bs->drv->format_name);
3076 }
3077
3078 flags = bs->open_flags | BDRV_O_RDWR;
3079 target_backing_bs = bdrv_cow_bs(bdrv_skip_filters(bs));
3080 if (!target_backing_bs && arg->sync == MIRROR_SYNC_MODE_TOP) {
3081 arg->sync = MIRROR_SYNC_MODE_FULL;
3082 }
3083 if (arg->sync == MIRROR_SYNC_MODE_NONE) {
3084 target_backing_bs = bs;
3085 }
3086 bdrv_graph_rdunlock_main_loop();
3087
3088 size = bdrv_getlength(bs);
3089 if (size < 0) {
3090 error_setg_errno(errp, -size, "bdrv_getlength failed");
3091 goto out;
3092 }
3093
3094 if (arg->replaces) {
3095 if (!arg->node_name) {
3096 error_setg(errp, "a node-name must be provided when replacing a"
3097 " named node of the graph");
3098 goto out;
3099 }
3100 }
3101
3102 if (arg->mode == NEW_IMAGE_MODE_ABSOLUTE_PATHS) {
3103 backing_mode = MIRROR_SOURCE_BACKING_CHAIN;
3104 } else {
3105 backing_mode = MIRROR_OPEN_BACKING_CHAIN;
3106 }
3107
3108 /* Don't open backing image in create() */
3109 flags |= BDRV_O_NO_BACKING;
3110
3111 if ((arg->sync == MIRROR_SYNC_MODE_FULL || !target_backing_bs)
3112 && arg->mode != NEW_IMAGE_MODE_EXISTING)
3113 {
3114 /* create new image w/o backing file */
3115 assert(format);
3116 bdrv_img_create(arg->target, format,
3117 NULL, NULL, NULL, size, flags, false, &local_err);
3118 } else {
3119 BlockDriverState *explicit_backing;
3120
3121 switch (arg->mode) {
3122 case NEW_IMAGE_MODE_EXISTING:
3123 break;
3124 case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
3125 /*
3126 * Create new image with backing file.
3127 * Implicit filters should not appear in the filename.
3128 */
3129 bdrv_graph_rdlock_main_loop();
3130 explicit_backing = bdrv_skip_implicit_filters(target_backing_bs);
3131 bdrv_refresh_filename(explicit_backing);
3132 bdrv_graph_rdunlock_main_loop();
3133
3134 bdrv_img_create(arg->target, format,
3135 explicit_backing->filename,
3136 explicit_backing->drv->format_name,
3137 NULL, size, flags, false, &local_err);
3138 break;
3139 default:
3140 abort();
3141 }
3142 }
3143
3144 if (local_err) {
3145 error_propagate(errp, local_err);
3146 goto out;
3147 }
3148
3149 options = qdict_new();
3150 if (arg->node_name) {
3151 qdict_put_str(options, "node-name", arg->node_name);
3152 }
3153 if (format) {
3154 qdict_put_str(options, "driver", format);
3155 }
3156 aio_context_release(aio_context);
3157
3158 /* Mirroring takes care of copy-on-write using the source's backing
3159 * file.
3160 */
3161 aio_context_acquire(qemu_get_aio_context());
3162 target_bs = bdrv_open(arg->target, NULL, options, flags, errp);
3163 aio_context_release(qemu_get_aio_context());
3164
3165 if (!target_bs) {
3166 return;
3167 }
3168
3169 bdrv_graph_rdlock_main_loop();
3170 zero_target = (arg->sync == MIRROR_SYNC_MODE_FULL &&
3171 (arg->mode == NEW_IMAGE_MODE_EXISTING ||
3172 !bdrv_has_zero_init(target_bs)));
3173 bdrv_graph_rdunlock_main_loop();
3174
3175
3176 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
3177 old_context = bdrv_get_aio_context(target_bs);
3178 aio_context_acquire(old_context);
3179
3180 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3181 if (ret < 0) {
3182 bdrv_unref(target_bs);
3183 aio_context_release(old_context);
3184 return;
3185 }
3186
3187 aio_context_release(old_context);
3188 aio_context_acquire(aio_context);
3189
3190 blockdev_mirror_common(arg->job_id, bs, target_bs,
3191 arg->replaces, arg->sync,
3192 backing_mode, zero_target,
3193 arg->has_speed, arg->speed,
3194 arg->has_granularity, arg->granularity,
3195 arg->has_buf_size, arg->buf_size,
3196 arg->has_on_source_error, arg->on_source_error,
3197 arg->has_on_target_error, arg->on_target_error,
3198 arg->has_unmap, arg->unmap,
3199 NULL,
3200 arg->has_copy_mode, arg->copy_mode,
3201 arg->has_auto_finalize, arg->auto_finalize,
3202 arg->has_auto_dismiss, arg->auto_dismiss,
3203 errp);
3204 bdrv_unref(target_bs);
3205 out:
3206 aio_context_release(aio_context);
3207 }
3208
3209 void qmp_blockdev_mirror(const char *job_id,
3210 const char *device, const char *target,
3211 const char *replaces,
3212 MirrorSyncMode sync,
3213 bool has_speed, int64_t speed,
3214 bool has_granularity, uint32_t granularity,
3215 bool has_buf_size, int64_t buf_size,
3216 bool has_on_source_error,
3217 BlockdevOnError on_source_error,
3218 bool has_on_target_error,
3219 BlockdevOnError on_target_error,
3220 const char *filter_node_name,
3221 bool has_copy_mode, MirrorCopyMode copy_mode,
3222 bool has_auto_finalize, bool auto_finalize,
3223 bool has_auto_dismiss, bool auto_dismiss,
3224 Error **errp)
3225 {
3226 BlockDriverState *bs;
3227 BlockDriverState *target_bs;
3228 AioContext *aio_context;
3229 AioContext *old_context;
3230 BlockMirrorBackingMode backing_mode = MIRROR_LEAVE_BACKING_CHAIN;
3231 bool zero_target;
3232 int ret;
3233
3234 bs = qmp_get_root_bs(device, errp);
3235 if (!bs) {
3236 return;
3237 }
3238
3239 target_bs = bdrv_lookup_bs(target, target, errp);
3240 if (!target_bs) {
3241 return;
3242 }
3243
3244 zero_target = (sync == MIRROR_SYNC_MODE_FULL);
3245
3246 /* Honor bdrv_try_change_aio_context() context acquisition requirements. */
3247 old_context = bdrv_get_aio_context(target_bs);
3248 aio_context = bdrv_get_aio_context(bs);
3249 aio_context_acquire(old_context);
3250
3251 ret = bdrv_try_change_aio_context(target_bs, aio_context, NULL, errp);
3252
3253 aio_context_release(old_context);
3254 aio_context_acquire(aio_context);
3255
3256 if (ret < 0) {
3257 goto out;
3258 }
3259
3260 blockdev_mirror_common(job_id, bs, target_bs,
3261 replaces, sync, backing_mode,
3262 zero_target, has_speed, speed,
3263 has_granularity, granularity,
3264 has_buf_size, buf_size,
3265 has_on_source_error, on_source_error,
3266 has_on_target_error, on_target_error,
3267 true, true, filter_node_name,
3268 has_copy_mode, copy_mode,
3269 has_auto_finalize, auto_finalize,
3270 has_auto_dismiss, auto_dismiss,
3271 errp);
3272 out:
3273 aio_context_release(aio_context);
3274 }
3275
3276 /*
3277 * Get a block job using its ID. Called with job_mutex held.
3278 */
3279 static BlockJob *find_block_job_locked(const char *id, Error **errp)
3280 {
3281 BlockJob *job;
3282
3283 assert(id != NULL);
3284
3285 job = block_job_get_locked(id);
3286
3287 if (!job) {
3288 error_set(errp, ERROR_CLASS_DEVICE_NOT_ACTIVE,
3289 "Block job '%s' not found", id);
3290 return NULL;
3291 }
3292
3293 return job;
3294 }
3295
3296 void qmp_block_job_set_speed(const char *device, int64_t speed, Error **errp)
3297 {
3298 BlockJob *job;
3299
3300 JOB_LOCK_GUARD();
3301 job = find_block_job_locked(device, errp);
3302
3303 if (!job) {
3304 return;
3305 }
3306
3307 block_job_set_speed_locked(job, speed, errp);
3308 }
3309
3310 void qmp_block_job_cancel(const char *device,
3311 bool has_force, bool force, Error **errp)
3312 {
3313 BlockJob *job;
3314
3315 JOB_LOCK_GUARD();
3316 job = find_block_job_locked(device, errp);
3317
3318 if (!job) {
3319 return;
3320 }
3321
3322 if (!has_force) {
3323 force = false;
3324 }
3325
3326 if (job_user_paused_locked(&job->job) && !force) {
3327 error_setg(errp, "The block job for device '%s' is currently paused",
3328 device);
3329 return;
3330 }
3331
3332 trace_qmp_block_job_cancel(job);
3333 job_user_cancel_locked(&job->job, force, errp);
3334 }
3335
3336 void qmp_block_job_pause(const char *device, Error **errp)
3337 {
3338 BlockJob *job;
3339
3340 JOB_LOCK_GUARD();
3341 job = find_block_job_locked(device, errp);
3342
3343 if (!job) {
3344 return;
3345 }
3346
3347 trace_qmp_block_job_pause(job);
3348 job_user_pause_locked(&job->job, errp);
3349 }
3350
3351 void qmp_block_job_resume(const char *device, Error **errp)
3352 {
3353 BlockJob *job;
3354
3355 JOB_LOCK_GUARD();
3356 job = find_block_job_locked(device, errp);
3357
3358 if (!job) {
3359 return;
3360 }
3361
3362 trace_qmp_block_job_resume(job);
3363 job_user_resume_locked(&job->job, errp);
3364 }
3365
3366 void qmp_block_job_complete(const char *device, Error **errp)
3367 {
3368 BlockJob *job;
3369
3370 JOB_LOCK_GUARD();
3371 job = find_block_job_locked(device, errp);
3372
3373 if (!job) {
3374 return;
3375 }
3376
3377 trace_qmp_block_job_complete(job);
3378 job_complete_locked(&job->job, errp);
3379 }
3380
3381 void qmp_block_job_finalize(const char *id, Error **errp)
3382 {
3383 BlockJob *job;
3384
3385 JOB_LOCK_GUARD();
3386 job = find_block_job_locked(id, errp);
3387
3388 if (!job) {
3389 return;
3390 }
3391
3392 trace_qmp_block_job_finalize(job);
3393 job_ref_locked(&job->job);
3394 job_finalize_locked(&job->job, errp);
3395
3396 job_unref_locked(&job->job);
3397 }
3398
3399 void qmp_block_job_dismiss(const char *id, Error **errp)
3400 {
3401 BlockJob *bjob;
3402 Job *job;
3403
3404 JOB_LOCK_GUARD();
3405 bjob = find_block_job_locked(id, errp);
3406
3407 if (!bjob) {
3408 return;
3409 }
3410
3411 trace_qmp_block_job_dismiss(bjob);
3412 job = &bjob->job;
3413 job_dismiss_locked(&job, errp);
3414 }
3415
3416 void qmp_block_job_change(BlockJobChangeOptions *opts, Error **errp)
3417 {
3418 BlockJob *job;
3419
3420 JOB_LOCK_GUARD();
3421 job = find_block_job_locked(opts->id, errp);
3422
3423 if (!job) {
3424 return;
3425 }
3426
3427 block_job_change_locked(job, opts, errp);
3428 }
3429
3430 void qmp_change_backing_file(const char *device,
3431 const char *image_node_name,
3432 const char *backing_file,
3433 Error **errp)
3434 {
3435 BlockDriverState *bs = NULL;
3436 AioContext *aio_context;
3437 BlockDriverState *image_bs = NULL;
3438 Error *local_err = NULL;
3439 bool ro;
3440 int ret;
3441
3442 bs = qmp_get_root_bs(device, errp);
3443 if (!bs) {
3444 return;
3445 }
3446
3447 aio_context = bdrv_get_aio_context(bs);
3448 aio_context_acquire(aio_context);
3449
3450 bdrv_graph_rdlock_main_loop();
3451
3452 image_bs = bdrv_lookup_bs(NULL, image_node_name, &local_err);
3453 if (local_err) {
3454 error_propagate(errp, local_err);
3455 goto out_rdlock;
3456 }
3457
3458 if (!image_bs) {
3459 error_setg(errp, "image file not found");
3460 goto out_rdlock;
3461 }
3462
3463 if (bdrv_find_base(image_bs) == image_bs) {
3464 error_setg(errp, "not allowing backing file change on an image "
3465 "without a backing file");
3466 goto out_rdlock;
3467 }
3468
3469 /* even though we are not necessarily operating on bs, we need it to
3470 * determine if block ops are currently prohibited on the chain */
3471 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_CHANGE, errp)) {
3472 goto out_rdlock;
3473 }
3474
3475 /* final sanity check */
3476 if (!bdrv_chain_contains(bs, image_bs)) {
3477 error_setg(errp, "'%s' and image file are not in the same chain",
3478 device);
3479 goto out_rdlock;
3480 }
3481 bdrv_graph_rdunlock_main_loop();
3482
3483 /* if not r/w, reopen to make r/w */
3484 ro = bdrv_is_read_only(image_bs);
3485
3486 if (ro) {
3487 if (bdrv_reopen_set_read_only(image_bs, false, errp) != 0) {
3488 goto out;
3489 }
3490 }
3491
3492 ret = bdrv_change_backing_file(image_bs, backing_file,
3493 image_bs->drv ? image_bs->drv->format_name : "",
3494 false);
3495
3496 if (ret < 0) {
3497 error_setg_errno(errp, -ret, "Could not change backing file to '%s'",
3498 backing_file);
3499 /* don't exit here, so we can try to restore open flags if
3500 * appropriate */
3501 }
3502
3503 if (ro) {
3504 bdrv_reopen_set_read_only(image_bs, true, errp);
3505 }
3506
3507 out:
3508 aio_context_release(aio_context);
3509 return;
3510
3511 out_rdlock:
3512 bdrv_graph_rdunlock_main_loop();
3513 aio_context_release(aio_context);
3514 }
3515
3516 void qmp_blockdev_add(BlockdevOptions *options, Error **errp)
3517 {
3518 BlockDriverState *bs;
3519 QObject *obj;
3520 Visitor *v = qobject_output_visitor_new(&obj);
3521 QDict *qdict;
3522
3523 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3524 visit_complete(v, &obj);
3525 qdict = qobject_to(QDict, obj);
3526
3527 qdict_flatten(qdict);
3528
3529 if (!qdict_get_try_str(qdict, "node-name")) {
3530 error_setg(errp, "'node-name' must be specified for the root node");
3531 goto fail;
3532 }
3533
3534 bs = bds_tree_init(qdict, errp);
3535 if (!bs) {
3536 goto fail;
3537 }
3538
3539 bdrv_set_monitor_owned(bs);
3540
3541 fail:
3542 visit_free(v);
3543 }
3544
3545 void qmp_blockdev_reopen(BlockdevOptionsList *reopen_list, Error **errp)
3546 {
3547 BlockReopenQueue *queue = NULL;
3548
3549 /* Add each one of the BDS that we want to reopen to the queue */
3550 for (; reopen_list != NULL; reopen_list = reopen_list->next) {
3551 BlockdevOptions *options = reopen_list->value;
3552 BlockDriverState *bs;
3553 AioContext *ctx;
3554 QObject *obj;
3555 Visitor *v;
3556 QDict *qdict;
3557
3558 /* Check for the selected node name */
3559 if (!options->node_name) {
3560 error_setg(errp, "node-name not specified");
3561 goto fail;
3562 }
3563
3564 bs = bdrv_find_node(options->node_name);
3565 if (!bs) {
3566 error_setg(errp, "Failed to find node with node-name='%s'",
3567 options->node_name);
3568 goto fail;
3569 }
3570
3571 /* Put all options in a QDict and flatten it */
3572 v = qobject_output_visitor_new(&obj);
3573 visit_type_BlockdevOptions(v, NULL, &options, &error_abort);
3574 visit_complete(v, &obj);
3575 visit_free(v);
3576
3577 qdict = qobject_to(QDict, obj);
3578
3579 qdict_flatten(qdict);
3580
3581 ctx = bdrv_get_aio_context(bs);
3582 aio_context_acquire(ctx);
3583
3584 queue = bdrv_reopen_queue(queue, bs, qdict, false);
3585
3586 aio_context_release(ctx);
3587 }
3588
3589 /* Perform the reopen operation */
3590 bdrv_reopen_multiple(queue, errp);
3591 queue = NULL;
3592
3593 fail:
3594 bdrv_reopen_queue_free(queue);
3595 }
3596
3597 void qmp_blockdev_del(const char *node_name, Error **errp)
3598 {
3599 AioContext *aio_context;
3600 BlockDriverState *bs;
3601
3602 GLOBAL_STATE_CODE();
3603 GRAPH_RDLOCK_GUARD_MAINLOOP();
3604
3605 bs = bdrv_find_node(node_name);
3606 if (!bs) {
3607 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3608 return;
3609 }
3610 if (bdrv_has_blk(bs)) {
3611 error_setg(errp, "Node %s is in use", node_name);
3612 return;
3613 }
3614 aio_context = bdrv_get_aio_context(bs);
3615 aio_context_acquire(aio_context);
3616
3617 if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, errp)) {
3618 goto out;
3619 }
3620
3621 if (!QTAILQ_IN_USE(bs, monitor_list)) {
3622 error_setg(errp, "Node %s is not owned by the monitor",
3623 bs->node_name);
3624 goto out;
3625 }
3626
3627 if (bs->refcnt > 1) {
3628 error_setg(errp, "Block device %s is in use",
3629 bdrv_get_device_or_node_name(bs));
3630 goto out;
3631 }
3632
3633 QTAILQ_REMOVE(&monitor_bdrv_states, bs, monitor_list);
3634 bdrv_unref(bs);
3635
3636 out:
3637 aio_context_release(aio_context);
3638 }
3639
3640 static BdrvChild * GRAPH_RDLOCK
3641 bdrv_find_child(BlockDriverState *parent_bs, const char *child_name)
3642 {
3643 BdrvChild *child;
3644
3645 QLIST_FOREACH(child, &parent_bs->children, next) {
3646 if (strcmp(child->name, child_name) == 0) {
3647 return child;
3648 }
3649 }
3650
3651 return NULL;
3652 }
3653
3654 void qmp_x_blockdev_change(const char *parent, const char *child,
3655 const char *node, Error **errp)
3656 {
3657 BlockDriverState *parent_bs, *new_bs = NULL;
3658 BdrvChild *p_child;
3659
3660 bdrv_graph_wrlock(NULL);
3661
3662 parent_bs = bdrv_lookup_bs(parent, parent, errp);
3663 if (!parent_bs) {
3664 goto out;
3665 }
3666
3667 if (!child == !node) {
3668 if (child) {
3669 error_setg(errp, "The parameters child and node are in conflict");
3670 } else {
3671 error_setg(errp, "Either child or node must be specified");
3672 }
3673 goto out;
3674 }
3675
3676 if (child) {
3677 p_child = bdrv_find_child(parent_bs, child);
3678 if (!p_child) {
3679 error_setg(errp, "Node '%s' does not have child '%s'",
3680 parent, child);
3681 goto out;
3682 }
3683 bdrv_del_child(parent_bs, p_child, errp);
3684 }
3685
3686 if (node) {
3687 new_bs = bdrv_find_node(node);
3688 if (!new_bs) {
3689 error_setg(errp, "Node '%s' not found", node);
3690 goto out;
3691 }
3692 bdrv_add_child(parent_bs, new_bs, errp);
3693 }
3694
3695 out:
3696 bdrv_graph_wrunlock(NULL);
3697 }
3698
3699 BlockJobInfoList *qmp_query_block_jobs(Error **errp)
3700 {
3701 BlockJobInfoList *head = NULL, **tail = &head;
3702 BlockJob *job;
3703
3704 JOB_LOCK_GUARD();
3705
3706 for (job = block_job_next_locked(NULL); job;
3707 job = block_job_next_locked(job)) {
3708 BlockJobInfo *value;
3709
3710 if (block_job_is_internal(job)) {
3711 continue;
3712 }
3713 value = block_job_query_locked(job, errp);
3714 if (!value) {
3715 qapi_free_BlockJobInfoList(head);
3716 return NULL;
3717 }
3718 QAPI_LIST_APPEND(tail, value);
3719 }
3720
3721 return head;
3722 }
3723
3724 void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,
3725 bool has_force, bool force, Error **errp)
3726 {
3727 AioContext *old_context;
3728 AioContext *new_context;
3729 BlockDriverState *bs;
3730
3731 GRAPH_RDLOCK_GUARD_MAINLOOP();
3732
3733 bs = bdrv_find_node(node_name);
3734 if (!bs) {
3735 error_setg(errp, "Failed to find node with node-name='%s'", node_name);
3736 return;
3737 }
3738
3739 /* Protects against accidents. */
3740 if (!(has_force && force) && bdrv_has_blk(bs)) {
3741 error_setg(errp, "Node %s is associated with a BlockBackend and could "
3742 "be in use (use force=true to override this check)",
3743 node_name);
3744 return;
3745 }
3746
3747 if (iothread->type == QTYPE_QSTRING) {
3748 IOThread *obj = iothread_by_id(iothread->u.s);
3749 if (!obj) {
3750 error_setg(errp, "Cannot find iothread %s", iothread->u.s);
3751 return;
3752 }
3753
3754 new_context = iothread_get_aio_context(obj);
3755 } else {
3756 new_context = qemu_get_aio_context();
3757 }
3758
3759 old_context = bdrv_get_aio_context(bs);
3760 aio_context_acquire(old_context);
3761
3762 bdrv_try_change_aio_context(bs, new_context, NULL, errp);
3763
3764 aio_context_release(old_context);
3765 }
3766
3767 QemuOptsList qemu_common_drive_opts = {
3768 .name = "drive",
3769 .head = QTAILQ_HEAD_INITIALIZER(qemu_common_drive_opts.head),
3770 .desc = {
3771 {
3772 .name = "snapshot",
3773 .type = QEMU_OPT_BOOL,
3774 .help = "enable/disable snapshot mode",
3775 },{
3776 .name = "aio",
3777 .type = QEMU_OPT_STRING,
3778 .help = "host AIO implementation (threads, native, io_uring)",
3779 },{
3780 .name = BDRV_OPT_CACHE_WB,
3781 .type = QEMU_OPT_BOOL,
3782 .help = "Enable writeback mode",
3783 },{
3784 .name = "format",
3785 .type = QEMU_OPT_STRING,
3786 .help = "disk format (raw, qcow2, ...)",
3787 },{
3788 .name = "rerror",
3789 .type = QEMU_OPT_STRING,
3790 .help = "read error action",
3791 },{
3792 .name = "werror",
3793 .type = QEMU_OPT_STRING,
3794 .help = "write error action",
3795 },{
3796 .name = BDRV_OPT_READ_ONLY,
3797 .type = QEMU_OPT_BOOL,
3798 .help = "open drive file as read-only",
3799 },
3800
3801 THROTTLE_OPTS,
3802
3803 {
3804 .name = "throttling.group",
3805 .type = QEMU_OPT_STRING,
3806 .help = "name of the block throttling group",
3807 },{
3808 .name = "copy-on-read",
3809 .type = QEMU_OPT_BOOL,
3810 .help = "copy read data from backing file into image file",
3811 },{
3812 .name = "detect-zeroes",
3813 .type = QEMU_OPT_STRING,
3814 .help = "try to optimize zero writes (off, on, unmap)",
3815 },{
3816 .name = "stats-account-invalid",
3817 .type = QEMU_OPT_BOOL,
3818 .help = "whether to account for invalid I/O operations "
3819 "in the statistics",
3820 },{
3821 .name = "stats-account-failed",
3822 .type = QEMU_OPT_BOOL,
3823 .help = "whether to account for failed I/O operations "
3824 "in the statistics",
3825 },
3826 { /* end of list */ }
3827 },
3828 };
3829
3830 QemuOptsList qemu_drive_opts = {
3831 .name = "drive",
3832 .head = QTAILQ_HEAD_INITIALIZER(qemu_drive_opts.head),
3833 .desc = {
3834 /*
3835 * no elements => accept any params
3836 * validation will happen later
3837 */
3838 { /* end of list */ }
3839 },
3840 };
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